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The complex time course of tension decay was investigated in fast-twitch permeabilized rabbit muscle fibers when they were relaxed from the rigor state using photochemical generation of ATP. A novel caged ATP compound, the P3–3',5'-dimethoxybenzoin ester of ATP (DMB-caged ATP), as well as the P3–1-(2-nitrophenyl)ethyl ester of ATP (NPE-caged ATP), have been used. DMB-caged ATP photolyzes at least...