RNAi knock-down of desatF in oenocytes leads to a dramatic decrease in dienes counter-balanced by an increase in monoenes. A. Percentages of different classes of hydrocarbons (dienes, monoenes, saturated, female pheromones, male-type pheromones) B. Percentages of the specific hydrocarbons according to their class and their length. All the hydrocarbon differences between control (1407-GAL4/+) and desatF knocked-down lines (1407-GAL4/UAS-desatF RNAi) were significantly different (P < 0.001, Student's t-test).