Biogenesis of lysosome-related organelles complex 1
BLOC-1 or biogenesis of lysosome-related organelles complex 1 is a ubiquitously expressed multisubunit protein complex in a group of complexes that also includes BLOC-2 and BLOC-3. BLOC-1 is required for normal biogenesis of specialized organelles of the endosomal-lysosomal system, such as melanosomes and platelet dense granules.
Source: Wikipedia — Biogenesis of lysosome-related organelles complex 1 (CC BY-SA 4.0)