Figure 2From: Species differences in brain gene expression profiles associated with adult behavioral maturation in honey bees4(A to D): Results of a Principal Component Analysis of the 218 genes expressed significantly differently between at least two species (p < 0.001). Each bar represents a replicate F/DO ratio. Color key/abbreviation: Blue = Apis florea/AF, Green = A. cerana/AC, Yellow = A. mellifera/AM, Red = A. dorsata/AD. The order of species is the same in every graph. Different letters of the alphabet depict significantly different mean values according to a post-hoc Tukey's test on an ANOVA of the principal components. Gene loadings on principal components provided in Additional file 1.Back to article page