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. 2001 Nov 12;155(4):625–636. doi: 10.1083/jcb.200103128

Table II. Summary of surface density estimates.

Myosin ATPase rate Myosin density Available heads
μg/ml nM/min heads/μm2 heads/μm actin
M5HMM 1 0.03 72 3.7
M5HMM 5 0.09 215 11.1
Myosin IIa 5 0.35 270 7.0
Myosin IIa 10 0.67 514 13
a

Smooth muscle myosin II data taken from Harris and Warshaw, 1993.