Control of growth in Drosophila head by elbow and no ocelli.

The Drosophila head is a complex organ with a precise architecture. Most of it is occupied by the compound eyes and the antennae. The presumptive eye and antennal tissues of the fly, referred to as the eye-antennal imaginal discs, are allocated late in embryogenesis as two bilateral groups of approximately 20 cells. Before the second instar larval stage cellular growth and proliferation are continuous...