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Fig. 1.   Length dependencies of active force () and myosin phosphorylation () induced by 0.1 µM (A), 1 µM (B), 10 µM (C), and 100 µM (D) carbachol in bovine tracheal smooth muscle. Active force is expressed as fraction of force (F_o) induced by K⁺ depolarization at optimal length (L_o) for each muscle strip. Values are means ± SE (n = 4). Vertical bars are not shown when SE are smaller than symbol. Lines represent linear regression fits to data. LC, light chain.

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