>From inspecting the files Mapping250K_Nsp.na22.annot.csv and Mapping250K_Sty.na22.annot.csv, which I downloaded from the Affy web site, it seems to me that Affy's Mapping 500K Array Set SNP chips do not probe the p arms of chromosomes 13, 14, 15 and 22. Is that right? If so, does anyone know why that is? Thanks in advance. -Ben The information transmitted in this electronic communication...{{dropped}}

Human chromosomes 13, 14, 15, 21, and 22 are acrocentric chromosomes which lack a p arm. The only DNA content in the location of a p arm is stalk and satellite DNA and the ribosomal DNA. -- Stephanie K. Mewborn, Ph.D. Post-Doctoral Fellow McNally Lab University of Chicago, Department of Medicine G611 Mail Code: MC6088 5841 S. Maryland Ave. Chicago, IL 60637 Phone: 773.702.2684 Fax: 773.702.2681 Email: skmewbor at uchicago.edu Wittner, Ben, Ph.D. wrote: > >From inspecting the files Mapping250K_Nsp.na22.annot.csv and > Mapping250K_Sty.na22.annot.csv, which I downloaded from the Affy web site, it > seems to me that Affy's Mapping 500K Array Set SNP chips do not probe the p arms > of chromosomes 13, 14, 15 and 22. > > Is that right? > If so, does anyone know why that is? > > Thanks in advance. > > -Ben > > > The information transmitted in this electronic communication...{{dropped}} > > _______________________________________________ > Bioconductor mailing list > Bioconductor at stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor >