are a sub-class of Xanthophores. Xanthophores are but one type of Chromatophore. True (= full) axanthism would result in the lack of yellows and reds.

Pigment production and deposition within each Chromatophores is the result of a biochemical cascade (like a chain of reactions). A malfunction at any step along any of the steps in these cascades can cause issues in the production or deposition of a given pigment. The Tyrosinase positive and Tyrosinase negative forms of amelanism are but one example (but note that most of our hypotheses regarding the identification of "T " and "T-" amelanism in herps have NOT been tested).

-Cole

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