We generated microarray gene expression profiles for 94 samples comprising primary myoblasts and their corresponding immortalized clones in both differentiated and undifferentiated states (average of 4 cell culture replicates each) from 5 human subjects (Table 1; 2 healthy and 3 with Duchenne muscular dystrophy—DMD), together with primary populations of non-myogenic (CD56-ve) cells from the muscles of 8 other human subjects. The gene discussed is NCAM1; the disease is Duchenne muscular dystrophy.