the nitella-based in vitro motility assay developed by sheetz and spudich ( sheetz , m.p. , and spudich , j. a . ( 1983 ) nature 303 , 31-35 ) is a quantitative assay for measuring the velocity of myosin-coated beads over an organized substratum of actin .
C0007608
motility
C0001271
actin