Figure 5. Myofibrillogenesis by human myotubes formed in culture.
Human fetal and adult muscle cultures were maintained in differentiation medium for 7-10 days and immunostained. Immunostaining for myogenin (A) and myosin (B) shows expression of these proteins by multinucleated myotubes in both fetal and adult cultures. (C) Image shows formation of the contractile apparatus (arrows) that was observed in some myotubes. Scale Bar = 20μM