Excerpt from The Control of Pigment Formation in Amphibian Larvae
Some of these later results, it seems to me, lead one to take a little different view of the situation from the one taken by Riddle. He (1909, p. 334) speaks of the different colors of the tyrosin series as obtainable by different degrees of oxidation, for instance he says: At present the biological data are wanting to quantitatively seriate all of the several colors; but there is appar ently enough data to warrant the definite statement that yellow mice are forms with the power to oxidize tyrosin compounds to an intermediate point. If we adopt this view we are under the necessity of postulating some chemical difference between the oxidase in yellow mice and that in brown mice that causes this difference in oxidation.
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