Additional <i>in vitro</i> contractile properties of directly stimulated EDL muscles.

<p>*<0.03.</p><p>**<0.0001.</p><p>Muscle twitches recorded in mutant mice are smaller and have a longer time-to-peak tension. Reduced absolute values are due to smaller muscles in mutants because normalized twitch forces are not different from wild-type. Similar outcome is shown for tetanic force in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0029538#pone-0029538-g003" target="_blank">Figure 3</a>. MW:BW ratio%, percent muscle to body-weight; Pt(g), absolute twitch force; Pt (N/g), twitch force normalized to muscle weight; TPT, time-to-peak twitch tension; 1/2RT-twitch half-relaxation time; N, Newtons (force); ms, milliseconds.