Figure 4From: Linking melanism to brain development: expression of a melanism-related gene in barn owl feather follicles covaries with sleep ontogenyNestling spottiness correlates positively with PCSK2 expression in feather follicles. Data for male (triangles) and female (circles) cross-fostered nestlings. PCSK2 expression was positively correlated with nestling spottiness (Pearson’s correlation: r = 0.39, n = 75, p = 0.0006).Back to article page