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Influence of calcium concentration on isometric tension (F0). A: isometric tension versus pCa. pCa 8.0, passive tension, has been set to zero so that only cross-bridges are responsible for the active isometric tension values shown. B: Hill fits of the average active tension values of each data set. Isometric tension values, normalized to 1 at pCa 4.5, versus pCa. Square brackets in the legend indicate number of fibers tested. Error bars are SE. Dros, Drosophila; Leth, Lethocerus.
