GAP43 is expressed at all stages of skeletal muscle maturation.

<p>Representative western blot of samples obtained from: A) proliferating myoblasts; B) differentiated myotubes; and C) adult extensor digitorum longus (EDL, 4 months of age). On the right, a preparation obtained from mouse brain (D- Brain) is used as positive control. All specimens (i.e. satellite cells, myotubes, EDL and brain) show the same immuno-reaction at ∼43KDa, when probed with the mGAP43 antibody.