as under the experimental conditions ( 2 mm mgcl2 , 100 mm kcl , 37 degrees c , actin monomer concentration less than or equal to 0.5 microm ) actin filaments treadmilled , filaments elongated only at the barbed ends and the gelsolin-actin complex did not nucleate actin filaments to polymerize towards the pointed ends .
C0001271
actin
C0025979
actin filaments