Fig. 4

Ommochrome and melanin pigmentation pathway. Substrates/products (normal font) and genes/enzymes (italics) are given. Differentially expressed genes/enzymes are represented with red colour boxes. a In the ommochrome pigmentation pathway, kynurenine 3 monooxygenase was up-regulated in the two gynochrome morphs (i.e. the infuscans and infuscans-obsoleta morphs). b In the melanin pathway, the yellow gene was uniformly up-regulated in all the female morphs (see Fig. 3 and Additional file 1: Sheet 8–11)