but other evidence suggests that these activities do not need increased cytoplasmic [ ca2+ ] and that once actin-gelsolin complexes form in the presence of ca2+ in vitro , removal of free ca2+ causes dissociation of only one of two bound actin monomers from gelsolin and the resultant binary complexes can not sever actin filaments .
C0001271
actin
C0025979
actin filaments