Antenna to leg transformation.
Homozygous lethal without heat shock. Embryos exhibit transformation of parasegment 6 and exhibit complete suppression of Keilin's organ and ventral pits formation.
Heat shocked embryos have head and thoracic segments with A1 morphology. Heat shocked embryos also mutant for exd have head and thoracic segments with A3 morphology.
Mann and Hogness.