cleavage at the site 70,000 daltons from the n-terminus of the heavy chain caused about a 30-fold decrease in the actin concentration required to achieve half-maximal stimulation of the magnesium-adenosinetriphosphatase ( mg-atpase ) activity of unphosphorylated thymus myosin .
C0001477
magnesium-adenosinetriphosphatase
C0001473
atpase