AP3B2 (Adaptor-Related Protein Complex 3 Subunit Beta 2): AP3B2 is a subunit of the Adaptor-Related Protein Complex 3 (AP-3), which is involved in intracellular vesicle trafficking. It plays a key role in sorting cargo proteins to lysosomes and related organelles. Mutations in AP3B2 are associated with Hermansky-Pudlak syndrome, a disorder characterized by defects in pigmentation and platelet function.