Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation

Literature

PubMed

PubMed® comprises more than 38 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.

Featured Bookshelf titles

Drug Therapy for Early Rheumatoid Arthritis

A Systematic Review Update

Donahue KE, Gartlehner G, Schulman ER, et al.

LiverTox

Clinical and Research Information on Drug-Induced Liver Injury

Browse the Bookshelf

Literature databases

Bookshelf

Books and reports

MeSH

Ontology used for PubMed indexing

NLM Catalog

Books, journals and more in the NLM Collections

PubMed

Scientific and medical abstracts/citations

PubMed Central

Full-text journal articles

Data

Genes

Gene sequences and annotations used as references for the study of orthologs structure, expression, and evolution

Gene

Collected information about gene loci

GEO DataSets

Functional genomics studies

GEO Profiles

Gene expression and molecular abundance profiles

PopSet

Sequence sets from phylogenetic and population studies

Proteins

Protein sequences, 3-D structures, and tools for the study of functional protein domains and active sites

Conserved Domains

Conserved protein domains

Identical Protein Groups

Protein sequences grouped by identity

Protein

Protein sequences

Protein Family Models

Models representing homologous proteins with a common function

Structure

Experimentally-determined biomolecular structures

BLAST

A tool to find regions of similarity between biological sequences

blastn

Search nucleotide sequence databases

blastp

Search protein sequence databases

blastx

Search protein databases using a translated nucleotide query

tblastn

Search translated nucleotide databases using a protein query

Primer-BLAST

Find primers specific to your PCR template

Genomes

Genome sequence assemblies, large-scale functional genomics data, and source biological samples

Assembly

Genome assembly information

BioCollections

Museum, herbaria, and other biorepository collections

BioProject

Biological projects providing data to NCBI

BioSample

Descriptions of biological source materials

Genome

Genome sequencing projects by organism

Nucleotide

DNA and RNA sequences

SRA

High-throughput sequence reads

Taxonomy

Taxonomic classification and nomenclature

Clinical

Heritable DNA variations, associations with human pathologies, and clinical diagnostics and treatments

ClinicalTrials.gov

Privately and publicly funded clinical studies conducted around the world

ClinVar

Human variations of clinical significance

dbGaP

Genotype/phenotype interaction studies

dbSNP

Short genetic variations

dbVar

Genome structural variation studies

GTR

Genetic testing registry

MedGen

Medical genetics literature and links

OMIM

Online mendelian inheritance in man

PubChem

Repository of chemical information, molecular pathways, and tools for bioactivity screening

BioAssays

Bioactivity screening studies

Compounds

Chemical information with structures, information and links

Pathways

Molecular pathways with links to genes, proteins and chemicals

Substances

Deposited substance and chemical information

News

Research news

The Scientist AUG. 13, 2024

Study Reveals a Cell-Eat-Cell World

From normal vertebrate development to tumor cell cannibalism, cell-in-cell events occur in many different contexts across the tree of life

The Scientist AUG. 8, 2024

Researchers Bioengin-Ear Tissue Scaffolds to Human Scale

A new approach to sculpting human-like ears merges 3D printing, xenografts, and tissue engineering.

NPR News AUG. 8, 2024

Do cats experience grief? New research suggests they might

Joe Hernandez

Researchers from Oakland University surveyed hundreds of cat caregivers and found that cats exhibited behaviors associated with grief after a fellow cat or dog in the household died.

More news

Recent blog posts

NIH Director's Blog YESTERDAY

Discovery of Culprit Behind Scars in Heart Failure Points to Possible Treatment Target

More than 6 million adults in the U.S. have heart failure, a condition that develops when the heart can’t pump enough blood to meet the demands of the body. While lifestyle changes and treatment can slow heart failure, there’s no cure. One reason is that heart failure and other heart conditions including heart attacks lead heart muscle to become thickened and scarred in a process known as fibrosis. Effective strategies to reverse or stop fibrosis in the heart or other organs after injury, as is needed for recovery, have remained elusive. Now, a new NIH-supported study offers a step forward in better understanding what happens in human heart failure. These findings, reported in Nature, identify a cell type that may be a main culprit in the formation of scar tissue after heart injury. What’s even more encouraging is that the study, which included mouse models, suggests that existing treatments that block communication between the immune system and the scar-forming cells may hold promise for limiting fibrosis to improve heart function.

NCBI Insights YESTERDAY

RefSeq Release 227 is Available!

Check out RefSeq release 227, now available online and from the FTP site. You can access RefSeq data through NCBI Datasets. The release is provided in several directories as a complete dataset and also as divided by logical groupings. What’s included in this release? As of November 4, 2024, this full release incorporates genomic, transcript, and protein data containing: … Continue reading RefSeq Release 227 is Available!

NLM Musings NOV. 13, 2024

DiscoverWHR: Centralizing NIH’s Investments in Women’s Health Research

With DiscoverWHR—a new resource from the NIH Office of Research on Women’s Health (ORWH) and NLM—users now have easy access to NIH-funded research on the important topic of women’s health research. Explore studies, grants, clinical trials, and more on topics like menopause, PCOS, and autoimmune diseases.