Yolk pigments of the Mexican leaf frog

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Science  25 Feb 1983:
Vol. 219, Issue 4587, pp. 985-987
DOI: 10.1126/science.6681678


Eggs of the Mexican leaf frog contain blue and yellow pigments identified as biliverdin and lutein, respectively. Both pigments are bound to proteins that occur in crystalline form in the yolk platelet. The major blue pigment is biliverdin IX alpha. The eggs vary in color from brilliant blue to pale yellow-green depending on the amount of each pigment. These pigments may provide protective coloration to the eggs.