2. Ebashi, S. and Endo, M. (1968) Calcium ion and muscle contrac-tion. Prog. Biophys. Mol. Biol. 18, 123-183
5. Potter, J. D. and Gergely, J, (1975) The calcium and magnesium binding sites on troponin and their role in the regulation of myofibrillar adenosine triphosphatase. J. Biol. Chem. 250, 4628-4633