Amino acid replacement S213A, in the Rel homology region of the protein.
One copy of dlS213A does not rescue embryos derived from dl null mothers to hatching, while two copies of dlS213A supports a low level of hatching of embryos derived from dl null mothers. Embryos derived from dl null mothers carrying one copy of dlS213A are weakly dorsalised, while those embryos derived from dl null mothers carrying two copies of dlS213A have wild-type cuticles. Embryos derived from dl1 cact7 mothers carrying dlS213A are strongly ventralised and do not hatch.
dlS213A partially rescues dlunspecified