Printing by NIAID / Microarray Research Facility Surface type: non-adsorptive, polylysine-coated glass Attachment: covalent, (UV-treated polylysine) Array description: The custom microarrays are manufactured by the Microarray Research Facility of the National Institute of Allergy and Infectious Diseases (NIH/NIAID). Microarrays are printed with an Omnigrid robotic arrayer by GeneMachines (http://www.genemachines.com) that is fitted with a printhead and 16 SMP5 print tips from Telechem (http://www.arrayit.com). The M. tuberculosis microarray (Mtaa) probe set is based on 70mer oligonucleotides from Qiagen's Tuberculosis Genome Oligo Set V1 (http://oligos.qiagen.com/arrays/omad.php). Oligonucleotide probes are distributed into 384-well polypropylene plates (Genetix, 384 micro array) and dissolved in 4XSSC print buffer at a normalized 25 micromolar concentration. The Mtaa microarray spot densities are 250 microns(center-to-center). The microarrays are printed on poly-L-lysine coated slides and post-processed according to the procedures on the Stanford website: http://cmgm.stanford.edu/pbrown/protocols/index.html