It is in the lumiHumanV1 or lumiHumanV2 annotation library. -Simon ==================================== Message: 17 Date: Mon, 4 Jun 2007 21:17:23 -0700 (PDT) From: Yu Chuan Tai <yuchuan@stat.berkeley.edu> Subject: [BioC] BeadChip location info. To: bioconductor at stat.math.ethz.ch Message-ID: <pine.lnx.4.64.0706042112160.27694 at="" treebeard.berkeley.edu=""> Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Hi list, I am new to the Illumnia Sentrix Human-6 BeadChip and have a basic question which I didn't find an answer in the archive. Just want to know how I can get the chromosome location informationm for each bead type, if I have a txt file with all the ID_REF? Thanks! Yu Chuan