sodium dodecyl sulfate-polyacrylamide gel analysis shows that , in addition to actin , microfilaments isolated from ref-52 cells contain five species of tropomyosin with apparent mr = 40,000 , 36,500 , 35,000 , 32,400 , and 32,000 , alpha-actinin , and as yet unknown proteins with apparent mr = 83,000 and 37,000 .
C0001271
actin
C0025979
microfilaments