FIGURE 7.

Effect of dextran on the force-SL relationship. The force-SL relationships obtained at activations with 6 mM MgADP and 1 mM MgATP in the absence of Ca²⁺, with 1% (w/v) dextran T-500 (four myofibrils; □) and without dextran (four myofibrils; •), are shown. The data at 6 mM MgADP without dextran are replotted from Fig. 4 (the data with standard deviation are shown in Supplementary Fig. S3 B, Supplementary Material). The lines were drawn by eye.