Albinism is due to one of several gene mutations that affect the production of normal pigmentation. True albino, or amelanistic,
animals lack melanin and are white with no markings and with unpigmented pink eyes. In some species there is also a form known
as blue-eyed (or "partial") albinism. There are also various degrees of patchy albinism where only part of the body is affected.
Leucism is similar to albinism and is often mistaken for albinism; leucistic animals are white with dark eyes and some
pigmentation, for example ghost markings.
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