Relative force decrease (%) in contractions produced in the different experimental conditions, when compared to contractions produced at pCa²⁺ 4.5.

<p>Legend: (i) first set of experiment, with fibers activated at four Ca²⁺ concentrations, (ii) second set of experiments, with fibers activated in presence or absence of blebbistatin, and (iii) third set of experiments, with fibers activated in pCa²⁺ 4.5 (with and without blebbistatin) and pCa²⁺ 6.0. The three sets of experiments correspond to the description given in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0029356#s2" target="_blank">Methods</a>.</p><p>*Significantly different from contractions produced at pCa²⁺ 4.5 (p≤0.05).