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Frequency-force relationship for GM contractions in WT and Cav2−/− mice. A: specific force production was greater from 40 Hz to 120 Hz in Cav2−/− mice compared with WT mice. B: active force produced at each stimulation frequency (P) normalized to maximal force production (Po). Summary data are means ± SE; n = 5 per group. *P < 0.05 for Cav2−/− vs. WT at indicated stimulation frequencies.
