We know what a T positive is for humans and some other animals, cats,.., genes and phenotype are identified ! Not for boas and reptiles in general.
There are also some forms of albinisme that allow eumelanine devellopement with age with more or less phaenomelanine , some not, in some formes that devellopement is located only on some area of the body, ....
So to understand the reptiles, we have to learn from other species mutations.

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