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.
