Albinism is a form of hypopigmentary congenital disorder, characterized by a partial lack or total absence of melanin pigment in the eyes, skin and hair, or more rarely in the eyes alone. Albinism results from inheritance of recessive gene alleles. The condition is known to affect all vertebrates, including humans. While the most common term for an organism affected by albinism is "albino" (noun and adjective), the word is sometimes used in derogatory ways towards people; more neutral terms are "albinistic" (adjective) and "person with albinism" (noun). Additional clinical adjectives sometimes used to refer to animals are "albinoid" and "albinic". It is not the same as leucism, in which all integumental pigment is at least partially absent, but the eyes retain their usual color.