Maju thinks this study indicates "patterns of inter-population differentiation are stronger in the genes of appearance mostly" and "the actual underlying differences between populations [. . .] are invariably much smaller than it looks".
But this is not what the paper shows at all. The single most highly population-differentiated gene group in the authors's analysis relates to pituitary gland development. Next comes dorsoventral neural tube patterning. Then some low-level cellular functions, more brain development, sperm motility and development, and thyroid gland development. Pigmentation comes about halfway down the list and hair follicle development below that.
The placement of pituitary- and thyroid-related genes near the head of the list brought to mind Carleton Coon's comments on endocrines and racial differences in temperament.