Amino acid replacement S70A, in the Rel homology region of the protein.
One copy of dlS70A does not rescue embryos derived from dl null mothers to hatching, while two copies of dlS70A supports a low level of hatching of embryos derived from dl null mothers. Embryos derived from dl null mothers carrying one copy of dlS70A are weakly dorsalised, while those embryos derived from dl null mothers carrying two copies of dlS70A have wild-type cuticles. Embryos derived from dl1 cact7 mothers carrying dlS70A are strongly ventralised and do not hatch.
dlS70A partially rescues dlunspecified