What is the physiological mechanism that causes Siamese cats to have darker pigmentation on their extremities?

Answer

The colorpoint pattern is a form of temperature-sensitive albinism

The colorpoint pattern is a type of temperature-sensitive albinism where darker pigment only develops in the cooler extremities of the body, such as the ears, paws, and tail.

What is the physiological mechanism that causes Siamese cats to have darker pigmentation on their extremities?
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