Structural abnormalities in itpr mosaic eyes. A, itpr mosaic eyes were noticeably larger and rounder in appearance than wild type (B, D) and frequently had areas of irregular and/or blackened facets (detail in C, D). E, Wild-type mosaic eyes (generated using an otherwise wild-type FRT chromosome) also sometimes showed irregular facets, but not the blackened facets or bulbous appearance of itpr mosaic eyes. F, Most dissociated ommatidia from itpr mosaic eyes appeared wild-type–like in appearance, but characteristically many still retained some of the axon terminal (arrow, right), which was almost invariably broken off in preparations from wild-type eyes. G, Ommatidial lengths and whole-cell capacitances in itpr mosaics were similar to those of controls (control = wild-type and itpr/TM6 pooled; mean ± SEM, n = 11–26 ommatidia/cells). Scale bars; (A, B) 80 µm, (C–E) 30 µm, (F) 10 µm.