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known as heteroxanthine, is an
active metabolite of
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theobromine (3,7-dimethylxanthine)...
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Varia Historia (12.14),
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xanthín),
which at the time,
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tawny (light brown) or auburn...
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Reptiles often possess at
least two pigments.
Among the most
common are
xanthin (yellow) and
erythrin (red). An
amelanistic reptile therefore, may still...
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species of
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retired in 1951. He died in
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Organism of Man (1912) (dissertation)
Recent Observations...