Actin-related protein 3B (ACTR3B)

Plays a role in the organization of the actin cytoskeleton. May function as ATP-binding part of the Arp2/3 complex that's involved in regulation of actin polymerization and together with an activating nucleation-promoting factor (NPF) mediates the formation of branched actin networks.

May reduce the metastatic potential of tumors. .