Actin
MOTOR PROTEIN INVOLVED IN MUSCLE CONTRACTION
G-actin; Alpha-actin; F-actin; Actins; Microfilament proteins; Microfilament protein; Actinous; F actin; G actin; Actin tail; Actin polymerization
Actin is a family of globular multi-functional proteins that form microfilaments in the cytoskeleton, and the thin filaments in muscle fibrils. It is found in essentially all eukaryotic cells, where it may be present at a concentration of over 100 μM; its mass is roughly 42 kDa, with a diameter of 4 to 7 nm.