Figure 3. y is required for the production of Dopamine-melanin.

The posterior abdominal segments of Drosophila melanogaster males (A5 and A6) are black (a). In y¹ mutant males, the black pigment is lost and only brown pigment is visible (b). Dorsal down-regulation of Ddc using pnr-Gal4 to drive an UAS-RNAi-Ddc transgene in males leads to loss of both black and brown pigments (c).