Hi, I've got some Affy U133A data, and I'd like to find out for each gene, which probeset represents the longest transcript. Is there a nice way to do this in BioC/BiomaRt? Thanks, Gad -- Gad Abraham PhD Student, Dept. CSSE and NICTA The University of Melbourne Parkville 3010, Victoria, Australia email: gabraham at csse.unimelb.edu.au web: http://www.csse.unimelb.edu.au/~gabraham