Fig. 10. MAPK cytoplasmic hold in the furrow. A diagram showing a section through the furrow, apical upwards and anterior rightwards. The furrow is moving from left to right. Phase 1 and phase 2 are indicated. Green nuclei are Atonal positive, yellow nuclei are Elav positive. Green cells are fated to become R8 photoreceptors, blue cells will become other photoreceptors. Red cells are the intermediate group, and have both high levels of Ras pathway activity and also MAPK cytoplasmic hold.