Posted by:
DMong
at Thu Jul 8 12:48:12 2010 [ Email Message ] [ Show All Posts by DMong ]
To be "axanthic", it cannot have ANY reds/oranges/yellows whatsoever.
It really is best described as being extremely "hypo-erythristic", or "hypo-xanthic" animal, as xanthophores are responsible for these pigment colors that can work in tandem with erythrophores.
Xanthophores
These chromatophores produce red and yellow pigments known as pteridines. These may vary in color from pure yellow to pure red, as well as intermediate shades. Xanthophores possessing a predominantly red coloration are referred to as erythrophores.
Xanthophores also retain yellow to reddish pigments contained in the diet in the form of carotenoids. Carotenoid retention continues throughout life, and intensity of pigmentation varies based on the quantity and types of carotenoids contained in the diet. Additionally, the animals' genetic predisposition towards and ability to store carotenoids will affect appearance.
regards, ~Doug
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"a snake in the grass is a GOOD thing" 
my website -serpentinespecialties.webs.com
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but it isn't axanthic - DMong, Thu Jul 8 12:48:12 2010