The function of ENSG00000242498 (ARPIN, actin related protein 2/3 complex inhibitor) is as follows. Regulates actin polymerization by inhibiting the actin- nucleating activity of the Arp2/3 complex; the function is competitive with nucleation promoting factors. Participates in an incoherent feedforward loop at the lamellipodium tip where it inhibits the ARP2/2 complex in response to Rac signaling and where Rac also stimulates actin polymerization through the WAVE complex. Involved in steering cell migration by controlling its directional persistence. .