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||"The actin treadmilling rate in cells is ~20 sec^-1, assuming that it is 200 times faster than the in vitro rate of 0.1 sec^-1 (1st primary source), i.e., there is a release of 20 subunits per pointed end per second (2nd primary source). Because
the rate-limiting step for actin-associated ATP hydrolysis is the
subunit release rate, a concentration of filament ends of 2µmol/l is required for 20 subunits per pointed end per second for the degradation of 40µmol ATP/liter/sec."