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Point coloration in cats oriqinated in the Siamese and closely related Asian breeds, and is found in many Western- developed modern breeds. It is a form of partial albinism resulting from a mutation that affects tyrosinase, an enzyme involved with melanin production. The mutated enzyme is thermolabile; it fails to work at normal body temperatures, but becomes active in cooler areas of the skin.[1] As a result, dark pigment is limited to the coldest areas of the body, that is, the extremities. Therefore, Siamese cats are literal heat maps of themselves. warm kitty cold kitty