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BLOC1S2 is a component of the ubiquitously expressed BLOC1 multisubunit protein complex. BLOC1 is required for normalbiogenesis of specialized organelles of the endosomal-lysosomal system, such as melanosomes and platelet densegranules (Starcevic and Dell'Angelica, 2004 (PubMed 15102850)).(supplied by OMIM)