Figure 2

Morphologic aspects of primary human skeletal muscle cultured in vitro. Adherent satellite cell 5 days post-plating in proliferation medium (A; 40×). Semiconfluent monolayers of myoblasts cultured in proliferation medium for 7 (B; 20×) and 10 days (C; 10×). Confluent myoblasts cultured in differentiation medium are in the process of fusing to form myotubes (D; 10×).