The number of genes that showed each of 27 possible expression patterns.

?1 denotes gene expression is higher in MB compared to the other region being compared, 0 denotes equal expression levels, while 1 denotes lower expression level in MB compared to the other region being compared. Abbreviations: CB = central brain, MB = mushroom bodies, OL = optic lobe, TG = thoracic ganglion; AM = A. mellifera, AD = A. dorsata, AF = A. florea.