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Fig. 6. Enhancement and suppression of the symmetrical division of GMC-1 in sim mutants. Embryos stained for Eve; anterior is up. Each panel is assembled from several photomicrographs of the same embryo to represent a continuous section of the CNS. Scale bars, 15 µm. (A) Wild-type embryo showing a smaller sib and a larger RP2. (B) sim mutant embryo. In 2 out of 10 hemisegments the GMC-1 has divided symmetrically to generate two RP2s (large arrows). (C,D) sim; Dp (2; 2) GYL embryos. In 6 out of 10 hemisegments shown the GMC-1 has divided symmetrically to generate two RP2s. (E) sim; Df (2L) GR4/+ embryo, GMC-1 divides normally to generate an RP2 and a sib.