MYBPC3 and skeletal muscle disorder: Taken together, these data suggest that in the adult 1) cMyBP-C is exclusively expressed in cardiac, but not skeletal, tissue of either WT or mdx mice, 2) fMyBP-C expression is increased in the absence of cMyBP-C in (t/t) mouse hearts, and 3) increased expression of sMyBP-C or fMyBP-C could be a marker of skeletal myopathy.