Figure 1. Ca²⁺ transients (a–d and e–g) and myosin heavy chain composition (a′–d′ and e′–g′) of dissociated fibres from soleus (A) and extensor digitorum longus (B) muscles from adult mice.

Note that each pair of results (i.e. a and a′, b and b′, etc.) comes from the same fibre. Controls are from whole muscles. C shows selected comparisons between Ca²⁺ transients from different types of fibres. Bottom panel illustrates the striking difference between records a and g, coming from fibres type I and IIB, respectively. All records were normalized.