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Several conflicting reports have been made regarding the affinity of myosin heads (subfragment 1 and heavy meromyosin (HMM) for regulated actin (actin complexed with tropomyosin and troponin) at low ionic strength (mu = 18-50 mM) and whether or not this interaction is Ca2+ sensitive (Chalovich, J. M., and Eisenberg, E. (1982) J. Biol. Chem. 257, 2432-2437;(More)
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