ARPC1B (Actin Related Protein 2/3 Complex Subunit 1B): ARPC1B is a gene that encodes a subunit of the actin-related protein 2/3 (ARP2/3) complex, which plays a crucial role in actin cytoskeleton organization and cell motility. Mutations in ARPC1B can lead to a rare immunodeficiency disorder known as ARPC1B deficiency, which affects immune cell function and host defense against infections....