three different in vitro preparations were used to nucleate the polymerization of muscle g-actin : ( a ) mv core fragments containing `` '' barbed '' '' and `` '' pointed '' '' filament ends exposed by shear during isolation , ( b ) isolated , membrane-intact brush borders , and ( c ) brush borders demembranated with triton-x 100 .
C0026049
mv
C1318418
( c ) brush bor