Construct: Amino acid replacement: T358A. Amino acid replacement: S364A.
Half of the embryos exhibit a class II phenotype: inhibition of head involution, elimination of dorsal head structures, transformation of T1 into a second thoracic segment and the appearance of one or two partial T2 denticle belts in the head segments. The remaining half exhibit additional abnormalities characteristic of class II and class IV phenotypes (problems with germ band retraction).