HPS4 and Hermansky-Pudlak syndrome: Family F900 was referred to us with albinism and was found to be homozygous for Hermansky-Pudlak syndrome-related variant HPS4:ENST00000398145.2:c.502-1 G > A and glucose/galactose malabsorption-related variant SLC5A1:NM_000343.4:c.765 C > G;p.(Cys255Trp) and hemizygous for the founder variant for hemolytic anemia G6PD:ENST00000393562.2:c.233 T > C;p.(Ile78Thr).