Construct: Nucleotide substitution: T7A. Nucleotide substitution: T8A. Encodes a maternal hb mRNA in which the endogenous wild-type nos response elements (NREs) have been deleted, and two copies of a mutant NRE have been inserted.
viable
Embryos expressing hbNRE.UU7AA have 7-8 abdominal segments, and most embryos develop into viable adults.