Acts upstream of or within pigmentation; platelet formation; and regulation of developmental pigmentation. Located in autophagosome and lysosome. Part of CORVET complex. Is expressed in ganglia. Used to study Hermansky-Pudlak syndrome. Orthologous to human VPS33A (VPS33A core subunit of CORVET and HOPS complexes). [provided by Alliance of Genome Resources, Apr 2022]