The Arp2/3 complex drives the polymerization of branched actin filaments and is composed of seven subunits. Two of these subunits are the Actin-related proteins 2 and 3 (Arp2 and Arp3) that are associated with the Actin-related protein complex subunits ARPC1, ARPC2, ARPC3, ARPC4 and ARPC5.
