RAB38 and Hermansky-Pudlak syndrome: In rats, only the Rab38-deficient rats carrying the Ruby phenotype, i.e., oculocutaneous albinism and bleeding diathesis, have been identified as a rat model of HPS, including Fawn-hooded rats, Tester-Moriyama rats, and Long Evans Cinnamon (LEC) rats [28,29,30].