In situ hybridization of PrUV (a, d, g), PrV (b, e, h), and PrB (c, f, i) mRNAs in female (a-c) and male (d-i) P. rapae crucivora. I (filled circles), II (dotted circles), and III (dashed circles) indicate type I, II, and III ommatidia, respectively. BM, Basement membrane; L, lamina; R, retina.