Figure 2. Responses of the 111 and 201 reflections to a step stretch under various conditions.

(A) pCa = 4.0; (B) pCa = 5.75; (C) pCa = 6.25; (D) relaxed; (E) pCa = 4.0, in the presence of 100 μM blebbistatin; (F) Igase-treated fibers, pCa = 4.0, in the presence of 100 μM blebbistatin. Black, 111; gray, 201. The inset in (A) is the fitting of the fast decay of 111 to a single exponential decay function. The numbers of fiber sets used: (A) 33; (B) 27; (C) 19; (D) 27; (E) 19; (F) 10.