Figure 1

Expression patterns and developmental functions of eyg in the Drosophila eye-antennal imaginal disc. Blue areas describe approximate expression domains of eyg. The three separately controlled and functional expression domains are numbered. The homogenous expression domain 1 in the first instar eye-antennal disc as well as the more confined expression domain 3 in a dorsal area of the third instar eye disc are essential for global head development. Expression domain 3 has also been found to be required for the development of specific lateral head bristles [25]. Expression domain 2 in the second larval instar eye disc is induced by N-signaling as part of the gene regulatory network that drives essential proliferation of the eye primordium in the posterior eye disc. Expression domain 2 ceases in front of the anteriorly progressing morphogenetic furrow (MF). Data from references 22 and 25. AD = antennal disc, ED = eye disc, EAD = eye-antennal imaginal disc, L1 = first larval instar, L2 = second larval instar, L3 = third larval instar. Dorsal up and posterior to the right.