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Fig. 1. The extra RP2 neuron in Drosophila mid mutants. Wild-type
and mid mutant Drosophila embryos, 13 to 14 hours old, were
stained with antibodies to Eve (A,B), Eve+Zfh1 (C-F) or
Eve+22C10 (G-L). Anterior is up, the midline is marked by vertical
lines. Arrow, RP2; arrow with asterisk, the extra RP2 (eRP2); small arrow,
axon projection from an RP2 or eRP2. ISN, intersegmental nerve bundle; fp1,
focal plane 1; fp2, focal plane 2.