Table II.

Summary of surface density estimates

MyosinATPase rateMyosin densityAvailable heads
μg/mlnM/minheads/μm2heads/μm actin
M5HMM10.03723.7
M5HMM50.0921511.1
Myosin IIa50.352707.0
Myosin IIa100.6751413
  • a Smooth muscle myosin II data taken from Harris and Warshaw, 1993.