Plumage polymorphism in the black sparrowhawk (Accipiter melanoleucus) is strongly associated with the expression level of agouti signaling protein.

Instead, the variation in both PTCA and BTCA levels appeared to be continuous, and a highly significant positive correlation was observed between the two variables ( F 1,18 = 113.2, P < 0.001, adjusted R 2 = 0.86) ( Fig. 4 ).

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