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Marker enzymes of oxidative (CS) and anaerobic (LDH) metabolism and of CK in myotubes cultured for different times. Open symbols, controls; filled symbols, with ionophore A23187 present after day 11. ∗, Significance of P < 0.02 of differences between control and ionophore-treated myotubes; n.s., lack of significant differences (P > 0.1).
