The BLOC (biogenesis of lysosome-related organelles complex) complexes are required for the biogenesis of specialized organelles of the endosomal-lysosomal system. In mammalian cells, BLOC-1 localizes to early endosomes and facilitates protein trafficking to melanosomes in melanocytes. In D.mel, BLOC-1 has been shown to be involved in pigment granule biogenesis. (Adapted from
FBrf0192474).