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Peak amplitude of [Ca2+]i response of myoblasts and myotubes to caffeine and CPA. Bar diagrams summarize the response of the cell types shown in Figure 4. (a) myoblasts (+/+); (b) myotubes (+/+); (c) myoblasts (−/−): application of 20 mM caffeine followed by 10 μM CPA; (d) myotubes (−/−): 2 successive applications of 20 mM caffeine followed by 10 μM CPA. The number of cells tested is given in brackets.
