g-actin freed from exogenous atp was added to the pieces of isolated acrosomal actin bundles from horseshoe crab sperm to form filaments as reported earlier ( tilney , l.g. , bonder , e.m. , & derosier , d.j . ( 1981 ) j. cell biol . 90 , 485-494 ) .
C0016890
g-actin
C0007634
cell