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" ... Dr. Hudon and his colleagues then extracted the pigments from the feathers. They separated the carotenoid pigments from each other using chromatography, and found that the mysterious auratus pigment is rhodoxanthin. This purple pigment is chemically similar to yellow pigments in egg yolks and to orange pigments found in carrots, but rhodoxanthin is found in only a few plants. In North America, it is found almost exclusively in the berries of two species of nonnative bush honeysuckles, Lonicera spp., which are now naturalized in eastern North America and the American Midwest. ... "
" ... On the icy streets of Dallas, a city currently experiencing record breaking cold that has led to blackouts, clean water shortages and deaths, Ramirez’s project, with its Americana and its carotenoid hues, is a bright spot of warmth. ... "
" ... Thus, the reduced carotenoid pigmentation in mosaic female canaries is not the result of less carotenoid pigments accumulating in their feathers but instead, it results from increased local degradation of carotenoids in specific tissues due to sex-specific up-regulation of the carotenoid-destroying enzyme, BCO2. ... "