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. 2011 Jul;138(1):117–130. doi: 10.1085/jgp.201010586

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© 2011 Clausen et al.

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Figure 4. — Effects of changes in voltage, pulse duration, and salbutamol on tetanic force in soleus from WT and mutant mice in the presence of 10⁻⁵ M tubocurarine. (A–C) Muscles were mounted in force transducers, and tetanic force was determined using 120-Hz pulse trains of 12 V (A), 7 V (B), and 7 V in the presence of 10⁻⁵ M salbutamol added 15 min before the onset of measurements (C). Pulse durations in the range of 0.02–1 ms as indicated. Each point represents the mean of observations on two muscles in A and B and the mean of four muscles in C, with error bars denoting SEM.