Chip contains 9216 features (probes and controls): 2014 PCR products from cDNA matrix using primers specific of genes involved in important biological process (apoptosis, cell cycle, stress response). 1684 PCR products from cDNA clones from the I.M.A.G.E consortium (Research Genetics collection). 2014 PCR products from mouse cDNA clones of a substractive bank (myodistrophic versus normal muscle). 1800 PCR products from rat cDNA clones of a substractive bank (atrophied versus normal muscle). 1704 control reporters.