All moral rights asserted. Recolouring or alteration of the image is prohibited without permission. Coloured scanning electron micrograph (SEM) of an ectopic eye mutant fruit fly (Drosophila melanogaster). In this mutant, the eyes grow on different parts of the body, here on the antennae. A switch for the gene that controls eye development was built into the animal at various chromosome regions by gene manipulation. Magnification: x110 when printed at 12 centimetres wide.