this ostensible segregation of alpha-actinin 's ability to cross-link f-actin filaments from its ability to increase rate of in vitro assays of contraction by tryptic digestion may suggest that alpha-actinin could have at least two different physiological roles : ( 1 ) to bind actin filaments to each other or to basal structures , and ( 2 ) to enhance the effectiveness of actin in supporting movement .
C0025979
actin filaments
C0001271
actin