when abp was added to preformed f-actin filaments , it bound until a maximum ratio of 1:9 ( abp : actin , mol : mol ) was reached . however , when actin was polymerized in the presence of abp , two and a half times more abp was able to bind to the actin- that is , every 3.4 actin monomers were now bound by an abp dimer .
C0025979
actin filaments
C0001271
actin