NCBI Home Page NCBI Site Search page NCBI Guide that lists and describes the NCBI resources
Conserved domains on  [gi|6137066|emb|CAB59617|]
View 

DNA-binding transcription factor, zf-fungal binuclear cluster type Toe2 [Schizosaccharomyces pombe]

Protein Classification

Zn(II)2Cys6 transcription factor( domain architecture ID 10637801)

Zn(II)2Cys6 transcription factor domain-containing proteins form a subclass of zinc finger proteins found exclusively in fungi

Gene Ontology:  GO:0008270|GO:0003700
PubMed:  9290251|16959962

Graphical summary

 Zoom to residue level

show extra options »

Show site features     Horizontal zoom: ×

List of domain hits

Name Accession Description Interval E-value
fungal_TF_MHR cd12148
fungal transcription factor regulatory middle homology region; This domain is present in the ...
186-581 2.67e-47

fungal transcription factor regulatory middle homology region; This domain is present in the large family of fungal zinc cluster transcription factors that contain an N-terminal GAL4-like C6 zinc binuclear cluster DNA-binding domain. Examples of members of this large fungal group are the following Saccharomyces cerevisiae transcription factors, GAL4, STB5, DAL81, CAT8, RDR1, HAL9, PUT3, PPR1, ASG1, RSF2, PIP2, as well as the C-terminal domain of the Cep3, a subunit of the yeast centromere-binding factor 3. It has been suggested that this region plays a regulatory role.


:

Pssm-ID: 213391  Cd Length: 410  Bit Score: 171.47  E-value: 2.67e-47
                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  186 PPKKVSDILIEQFFFRCHMLINVLHRPTFYVRYNDFWEKPHLRKPAFTSLLYAIYASALLATPVEVqktwALGEDERYLQ 265
Cdd:cd12148   1 PPREVADRLLDLYFENVHPLFPILHRPTFLRDLESLYSDPSSLSPASLALLLAVLALAALSLPDSE----LRGESRRSLA 76
                        90       100       110       120       130       140       150       160
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  266 VDYHQAFRYALASSNFLfEPDLNALQALVL-CQVVFDSDRIRAPPSLVGLILHVALCMGLHRDGSLY-GLNPVISEIRRR 343
Cdd:cd12148  77 ERYYEAARQLLDLALFL-PPSLETLQALLLlALYLLGTGDPSSAWLLLGLAIRLAQSLGLHRDPSSLpGLSPFERELRRR 155
                       170       180       190       200       210       220       230       240
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  344 VWANIVLSDLRTSETIGYPPQIVEGNYDTRLPSALPDEIHNVDSSVII-----SEATFVNIITKVSRAYSKCLKVLLGI- 417
Cdd:cd12148 156 LWWSLYILDRLLSLSLGRPPSISDEDIDVPLPSNEDDELSPSSSPPPPpseepTSLSFFIALIRLARILGRILRLLYSPr 235
                       250       260       270       280       290       300       310       320
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  418 ---IAPNYTRLLELDRELSNFFKELIEVNIPTSNTMHERHIRLLVSYLS---NRFPILLHFPFLLKK-----NSAQFAYS 486
Cdd:cd12148 236 assPEDSLETILELDAELEEWRASLPPELRLDSSSLESPSLLPQRLLLHllyHLLLILLHRPFLLRSlsslsPSSSSAES 315
                       330       340       350       360       370       380       390       400
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  487 HSRALESATLALNQLYELGSNPEYSKYSWYLWrYPPFHPCIVLLLDLLNSQKIIYLDDER------VVLLNKIFSLFPRS 560
Cdd:cd12148 316 RRACLEAAREILELLRLLLSSSLLLLLWWFLL-YYLFSAALVLLLALLLRPSSSELEEARslleraLELLERLSERWPRL 394
                       410       420
                ....*....|....*....|.
gi 6137066  561 SgkehyQKAWALLQTSRAKVW 581
Cdd:cd12148 395 A-----RRALRLLERLLARAR 410
GAL4 smart00066
GAL4-like Zn(II)2Cys6 (or C6 zinc) binuclear cluster DNA-binding domain; Gal4 is a positive ...
17-56 1.19e-11

GAL4-like Zn(II)2Cys6 (or C6 zinc) binuclear cluster DNA-binding domain; Gal4 is a positive regulator for the gene expression of the galactose- induced genes of S. cerevisiae. Is present only in fungi.


:

Pssm-ID: 214501 [Multi-domain]  Cd Length: 43  Bit Score: 59.68  E-value: 1.19e-11
                           10        20        30        40
                   ....*....|....*....|....*....|....*....|.
gi 6137066      17 RRAIHSCLACRRKKLKCDHGRP-CSNCLKRSTIqsCIYIDP 56
Cdd:smart00066   1 KRVSKACDRCRKRKIKCDGKKPpCSNCIKLGLE--CTYSDS 39
 
Name Accession Description Interval E-value
fungal_TF_MHR cd12148
fungal transcription factor regulatory middle homology region; This domain is present in the ...
186-581 2.67e-47

fungal transcription factor regulatory middle homology region; This domain is present in the large family of fungal zinc cluster transcription factors that contain an N-terminal GAL4-like C6 zinc binuclear cluster DNA-binding domain. Examples of members of this large fungal group are the following Saccharomyces cerevisiae transcription factors, GAL4, STB5, DAL81, CAT8, RDR1, HAL9, PUT3, PPR1, ASG1, RSF2, PIP2, as well as the C-terminal domain of the Cep3, a subunit of the yeast centromere-binding factor 3. It has been suggested that this region plays a regulatory role.


Pssm-ID: 213391  Cd Length: 410  Bit Score: 171.47  E-value: 2.67e-47
                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  186 PPKKVSDILIEQFFFRCHMLINVLHRPTFYVRYNDFWEKPHLRKPAFTSLLYAIYASALLATPVEVqktwALGEDERYLQ 265
Cdd:cd12148   1 PPREVADRLLDLYFENVHPLFPILHRPTFLRDLESLYSDPSSLSPASLALLLAVLALAALSLPDSE----LRGESRRSLA 76
                        90       100       110       120       130       140       150       160
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  266 VDYHQAFRYALASSNFLfEPDLNALQALVL-CQVVFDSDRIRAPPSLVGLILHVALCMGLHRDGSLY-GLNPVISEIRRR 343
Cdd:cd12148  77 ERYYEAARQLLDLALFL-PPSLETLQALLLlALYLLGTGDPSSAWLLLGLAIRLAQSLGLHRDPSSLpGLSPFERELRRR 155
                       170       180       190       200       210       220       230       240
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  344 VWANIVLSDLRTSETIGYPPQIVEGNYDTRLPSALPDEIHNVDSSVII-----SEATFVNIITKVSRAYSKCLKVLLGI- 417
Cdd:cd12148 156 LWWSLYILDRLLSLSLGRPPSISDEDIDVPLPSNEDDELSPSSSPPPPpseepTSLSFFIALIRLARILGRILRLLYSPr 235
                       250       260       270       280       290       300       310       320
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  418 ---IAPNYTRLLELDRELSNFFKELIEVNIPTSNTMHERHIRLLVSYLS---NRFPILLHFPFLLKK-----NSAQFAYS 486
Cdd:cd12148 236 assPEDSLETILELDAELEEWRASLPPELRLDSSSLESPSLLPQRLLLHllyHLLLILLHRPFLLRSlsslsPSSSSAES 315
                       330       340       350       360       370       380       390       400
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  487 HSRALESATLALNQLYELGSNPEYSKYSWYLWrYPPFHPCIVLLLDLLNSQKIIYLDDER------VVLLNKIFSLFPRS 560
Cdd:cd12148 316 RRACLEAAREILELLRLLLSSSLLLLLWWFLL-YYLFSAALVLLLALLLRPSSSELEEARslleraLELLERLSERWPRL 394
                       410       420
                ....*....|....*....|.
gi 6137066  561 SgkehyQKAWALLQTSRAKVW 581
Cdd:cd12148 395 A-----RRALRLLERLLARAR 410
Fungal_trans pfam04082
Fungal specific transcription factor domain; This domain is found in a number of fungal ...
195-437 4.43e-31

Fungal specific transcription factor domain; This domain is found in a number of fungal transcription factors including transcriptional activator xlnR, yeast regulatory protein GAL4, and nicotinate catabolism cluster-specific transcription factor HxnR.


Pssm-ID: 397964  Cd Length: 262  Bit Score: 122.21  E-value: 4.43e-31
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066    195 IEQFFFRCHMLINVLHRPTFYVRYNDFWEKPhlRKPAFTSLLYAIYASALLATPVEVQKTWALGEDERYLQVDYHQAFRY 274
Cdd:pfam04082   1 LDLFFKNFHPQFPILHRPSFLRDYFELFSSP--SNYASPLLLLAILALGALFSESPTARSSSSLTDEAADGIHFFLRALI 78
                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066    275 ALASSNFLFEPDLNALQALVLCQVVF-DSDRIRAPPSLVGLILHVALCMGLHRDGSLYG----LNPVISEIRRRVWANIV 349
Cdd:pfam04082  79 LIHEDFSSPSSSLWILQALLLLELYElGTGDRKLHWRYHGLAIRLARSLGLHRDPSYVSpswkLWIEEAELRRRLFWACF 158
                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066    350 LSDLRTSETIGYPPQIVEgnYDTRLPsaLPDEIHNVDSSVIISEATFVNI------------ITKVSRAYSKCLKVLLGI 417
Cdd:pfam04082 159 YLDRLISLILGRPPLLSD--SDIDLP--LPCDDDDLWESDSADEVTLPLIslesksikpplfLIKLSKILSKILGSLLSI 234
                         250       260
                  ....*....|....*....|....*...
gi 6137066    418 IAPNYTRLLE--------LDRELSNFFK 437
Cdd:pfam04082 235 RSTLDQRDLQlklswvreLERALDNWRK 262
Fungal_trans smart00906
Fungal specific transcription factor domain; This domain is found in a number of fungal ...
286-380 9.37e-12

Fungal specific transcription factor domain; This domain is found in a number of fungal transcription factors including transcriptional activator xlnR, yeast regulatory protein GAL4, and other transcription proteins regulating a variety of cellular and metabolic processes.


Pssm-ID: 214903 [Multi-domain]  Cd Length: 93  Bit Score: 61.32  E-value: 9.37e-12
                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066     286 DLNALQALVLCQVVFDSDRIRAPPSLVGLILHVALCMGLHRDGSLYGLNPvISEIRRRVWAnIVLSDLRTSETIGYPPQI 365
Cdd:smart00906   1 SLETVQALLLALLSLYLGGRDAAWMLLGLAIRLAQALGLHRDPSNSDLEE-RERRRRRFWW-LYILDRLLSLSLGRPPLI 78
                           90
                   ....*....|....*
gi 6137066     366 VEGNYDTRLPSALPD 380
Cdd:smart00906  79 DDDDIDVPLPSDLDD 93
GAL4 smart00066
GAL4-like Zn(II)2Cys6 (or C6 zinc) binuclear cluster DNA-binding domain; Gal4 is a positive ...
17-56 1.19e-11

GAL4-like Zn(II)2Cys6 (or C6 zinc) binuclear cluster DNA-binding domain; Gal4 is a positive regulator for the gene expression of the galactose- induced genes of S. cerevisiae. Is present only in fungi.


Pssm-ID: 214501 [Multi-domain]  Cd Length: 43  Bit Score: 59.68  E-value: 1.19e-11
                           10        20        30        40
                   ....*....|....*....|....*....|....*....|.
gi 6137066      17 RRAIHSCLACRRKKLKCDHGRP-CSNCLKRSTIqsCIYIDP 56
Cdd:smart00066   1 KRVSKACDRCRKRKIKCDGKKPpCSNCIKLGLE--CTYSDS 39
GAL4 cd00067
GAL4-like Zn2Cys6 binuclear cluster DNA-binding domain; found in transcription regulators like ...
18-53 2.05e-10

GAL4-like Zn2Cys6 binuclear cluster DNA-binding domain; found in transcription regulators like GAL4. Domain consists of two helices organized around a Zn(2)Cys(6 )motif; Binds to sequences containing 2 DNA half sites comprised of 3-5 C/G combinations


Pssm-ID: 238023 [Multi-domain]  Cd Length: 36  Bit Score: 55.75  E-value: 2.05e-10
                        10        20        30
                ....*....|....*....|....*....|....*..
gi 6137066   18 RAIHSCLACRRKKLKCDHG-RPCSNCLKRSTIqsCIY 53
Cdd:cd00067   1 RVRRACDRCRRRKIKCDGEkPPCSNCIKLGLE--CTY 35
Zn_clus pfam00172
Fungal Zn(2)-Cys(6) binuclear cluster domain;
21-53 3.11e-09

Fungal Zn(2)-Cys(6) binuclear cluster domain;


Pssm-ID: 395120 [Multi-domain]  Cd Length: 39  Bit Score: 52.69  E-value: 3.11e-09
                          10        20        30
                  ....*....|....*....|....*....|....
gi 6137066     21 HSCLACRRKKLKCDHGRP-CSNCLKRSTiqSCIY 53
Cdd:pfam00172   1 TACDNCRKRKVKCDGKKPaCSRCIKNGL--ECTY 32
 
Name Accession Description Interval E-value
fungal_TF_MHR cd12148
fungal transcription factor regulatory middle homology region; This domain is present in the ...
186-581 2.67e-47

fungal transcription factor regulatory middle homology region; This domain is present in the large family of fungal zinc cluster transcription factors that contain an N-terminal GAL4-like C6 zinc binuclear cluster DNA-binding domain. Examples of members of this large fungal group are the following Saccharomyces cerevisiae transcription factors, GAL4, STB5, DAL81, CAT8, RDR1, HAL9, PUT3, PPR1, ASG1, RSF2, PIP2, as well as the C-terminal domain of the Cep3, a subunit of the yeast centromere-binding factor 3. It has been suggested that this region plays a regulatory role.


Pssm-ID: 213391  Cd Length: 410  Bit Score: 171.47  E-value: 2.67e-47
                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  186 PPKKVSDILIEQFFFRCHMLINVLHRPTFYVRYNDFWEKPHLRKPAFTSLLYAIYASALLATPVEVqktwALGEDERYLQ 265
Cdd:cd12148   1 PPREVADRLLDLYFENVHPLFPILHRPTFLRDLESLYSDPSSLSPASLALLLAVLALAALSLPDSE----LRGESRRSLA 76
                        90       100       110       120       130       140       150       160
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  266 VDYHQAFRYALASSNFLfEPDLNALQALVL-CQVVFDSDRIRAPPSLVGLILHVALCMGLHRDGSLY-GLNPVISEIRRR 343
Cdd:cd12148  77 ERYYEAARQLLDLALFL-PPSLETLQALLLlALYLLGTGDPSSAWLLLGLAIRLAQSLGLHRDPSSLpGLSPFERELRRR 155
                       170       180       190       200       210       220       230       240
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  344 VWANIVLSDLRTSETIGYPPQIVEGNYDTRLPSALPDEIHNVDSSVII-----SEATFVNIITKVSRAYSKCLKVLLGI- 417
Cdd:cd12148 156 LWWSLYILDRLLSLSLGRPPSISDEDIDVPLPSNEDDELSPSSSPPPPpseepTSLSFFIALIRLARILGRILRLLYSPr 235
                       250       260       270       280       290       300       310       320
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  418 ---IAPNYTRLLELDRELSNFFKELIEVNIPTSNTMHERHIRLLVSYLS---NRFPILLHFPFLLKK-----NSAQFAYS 486
Cdd:cd12148 236 assPEDSLETILELDAELEEWRASLPPELRLDSSSLESPSLLPQRLLLHllyHLLLILLHRPFLLRSlsslsPSSSSAES 315
                       330       340       350       360       370       380       390       400
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066  487 HSRALESATLALNQLYELGSNPEYSKYSWYLWrYPPFHPCIVLLLDLLNSQKIIYLDDER------VVLLNKIFSLFPRS 560
Cdd:cd12148 316 RRACLEAAREILELLRLLLSSSLLLLLWWFLL-YYLFSAALVLLLALLLRPSSSELEEARslleraLELLERLSERWPRL 394
                       410       420
                ....*....|....*....|.
gi 6137066  561 SgkehyQKAWALLQTSRAKVW 581
Cdd:cd12148 395 A-----RRALRLLERLLARAR 410
Fungal_trans pfam04082
Fungal specific transcription factor domain; This domain is found in a number of fungal ...
195-437 4.43e-31

Fungal specific transcription factor domain; This domain is found in a number of fungal transcription factors including transcriptional activator xlnR, yeast regulatory protein GAL4, and nicotinate catabolism cluster-specific transcription factor HxnR.


Pssm-ID: 397964  Cd Length: 262  Bit Score: 122.21  E-value: 4.43e-31
                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066    195 IEQFFFRCHMLINVLHRPTFYVRYNDFWEKPhlRKPAFTSLLYAIYASALLATPVEVQKTWALGEDERYLQVDYHQAFRY 274
Cdd:pfam04082   1 LDLFFKNFHPQFPILHRPSFLRDYFELFSSP--SNYASPLLLLAILALGALFSESPTARSSSSLTDEAADGIHFFLRALI 78
                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066    275 ALASSNFLFEPDLNALQALVLCQVVF-DSDRIRAPPSLVGLILHVALCMGLHRDGSLYG----LNPVISEIRRRVWANIV 349
Cdd:pfam04082  79 LIHEDFSSPSSSLWILQALLLLELYElGTGDRKLHWRYHGLAIRLARSLGLHRDPSYVSpswkLWIEEAELRRRLFWACF 158
                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066    350 LSDLRTSETIGYPPQIVEgnYDTRLPsaLPDEIHNVDSSVIISEATFVNI------------ITKVSRAYSKCLKVLLGI 417
Cdd:pfam04082 159 YLDRLISLILGRPPLLSD--SDIDLP--LPCDDDDLWESDSADEVTLPLIslesksikpplfLIKLSKILSKILGSLLSI 234
                         250       260
                  ....*....|....*....|....*...
gi 6137066    418 IAPNYTRLLE--------LDRELSNFFK 437
Cdd:pfam04082 235 RSTLDQRDLQlklswvreLERALDNWRK 262
Fungal_trans smart00906
Fungal specific transcription factor domain; This domain is found in a number of fungal ...
286-380 9.37e-12

Fungal specific transcription factor domain; This domain is found in a number of fungal transcription factors including transcriptional activator xlnR, yeast regulatory protein GAL4, and other transcription proteins regulating a variety of cellular and metabolic processes.


Pssm-ID: 214903 [Multi-domain]  Cd Length: 93  Bit Score: 61.32  E-value: 9.37e-12
                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 6137066     286 DLNALQALVLCQVVFDSDRIRAPPSLVGLILHVALCMGLHRDGSLYGLNPvISEIRRRVWAnIVLSDLRTSETIGYPPQI 365
Cdd:smart00906   1 SLETVQALLLALLSLYLGGRDAAWMLLGLAIRLAQALGLHRDPSNSDLEE-RERRRRRFWW-LYILDRLLSLSLGRPPLI 78
                           90
                   ....*....|....*
gi 6137066     366 VEGNYDTRLPSALPD 380
Cdd:smart00906  79 DDDDIDVPLPSDLDD 93
GAL4 smart00066
GAL4-like Zn(II)2Cys6 (or C6 zinc) binuclear cluster DNA-binding domain; Gal4 is a positive ...
17-56 1.19e-11

GAL4-like Zn(II)2Cys6 (or C6 zinc) binuclear cluster DNA-binding domain; Gal4 is a positive regulator for the gene expression of the galactose- induced genes of S. cerevisiae. Is present only in fungi.


Pssm-ID: 214501 [Multi-domain]  Cd Length: 43  Bit Score: 59.68  E-value: 1.19e-11
                           10        20        30        40
                   ....*....|....*....|....*....|....*....|.
gi 6137066      17 RRAIHSCLACRRKKLKCDHGRP-CSNCLKRSTIqsCIYIDP 56
Cdd:smart00066   1 KRVSKACDRCRKRKIKCDGKKPpCSNCIKLGLE--CTYSDS 39
GAL4 cd00067
GAL4-like Zn2Cys6 binuclear cluster DNA-binding domain; found in transcription regulators like ...
18-53 2.05e-10

GAL4-like Zn2Cys6 binuclear cluster DNA-binding domain; found in transcription regulators like GAL4. Domain consists of two helices organized around a Zn(2)Cys(6 )motif; Binds to sequences containing 2 DNA half sites comprised of 3-5 C/G combinations


Pssm-ID: 238023 [Multi-domain]  Cd Length: 36  Bit Score: 55.75  E-value: 2.05e-10
                        10        20        30
                ....*....|....*....|....*....|....*..
gi 6137066   18 RAIHSCLACRRKKLKCDHG-RPCSNCLKRSTIqsCIY 53
Cdd:cd00067   1 RVRRACDRCRRRKIKCDGEkPPCSNCIKLGLE--CTY 35
Zn_clus pfam00172
Fungal Zn(2)-Cys(6) binuclear cluster domain;
21-53 3.11e-09

Fungal Zn(2)-Cys(6) binuclear cluster domain;


Pssm-ID: 395120 [Multi-domain]  Cd Length: 39  Bit Score: 52.69  E-value: 3.11e-09
                          10        20        30
                  ....*....|....*....|....*....|....
gi 6137066     21 HSCLACRRKKLKCDHGRP-CSNCLKRSTiqSCIY 53
Cdd:pfam00172   1 TACDNCRKRKVKCDGKKPaCSRCIKNGL--ECTY 32
 
Blast search parameters
Data Source: Precalculated data, version = cdd.v.3.21
Preset Options:Database: CDSEARCH/cdd   Low complexity filter: no  Composition Based Adjustment: yes   E-value threshold: 0.01

References:

  • Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
  • Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
  • Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
Help | Disclaimer | Write to the Help Desk
NCBI | NLM | NIH