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" ... These findings were predictable in European serins. For example, female serins showed less carotenoid pigmentation than males and had higher levels of BCO2 expression than males. Additionally, female serins had higher BCO2 expression than female canaries, and female canaries had predictably brighter carotenoid-based pigmentation than female serins. Finally, both male and female serins had lower expression of BCO2 in feather patches with stronger carotenoid pigmentation. Taken together, these finding suggest that BCO2 plays a role in sexual dichromatism in European serins as well as in canaries. ... "