title: Type IV melanosomes of the human albino iris.
abstract: Electron microscopy of an iris biopsy specimen from a clinically tyrosinase-negative human albino demonstrated type IV mature melanosomes. Possible mechanisms for the formation in this condition of these organelles, which have not previously been described at this site, are discussed.
mesh_terms: D000417:Albinism / Q000473:pathology*; D002452:Cell Count; D005260:Female; D006801:Humans; D007498:Iris / Q000648:ultrastructure*; D008544:Melanocytes / Q000648:ultrastructure*; D008854:Microscopy, Electron; D008875:Middle Aged; D009940:Organoids / Q000648:ultrastructure*