By the way, a tyrosinase positive albino may have less than the normal amount of melanin pigment, or it may not have any melanin pigment at all. Both the Kahl and Sharp albinos are put in the "no melanin" category. As the two genes are apparently not compatible, one albino strain may lack melanin because it produces defective tyrosinase. The other strain may lack melanin for a cause totally unrelated to tyrosinase. Testing is required to find out which is which. And testing might show that neither albino strain is tyrosinase negative.

Paul Hollander

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