Mutation is within the region between the first two zinc fingers, the D box.
Nucleotide substitution: C?T.
Amino acid replacement: Q477term.
C8692726T
C?T
Q477term | hb-PA; Q477term | hb-PB
Q477term
Homozygotes and heterozygotes with a wild type copy display a severely reduced head, up to three abdominal segments are formed in the head region.
As in the case of hb7, resembles a class I mutant, but with transformation of gnathal and first abdominal segments into posterior abdominal segments. Expression in homozygotes more extreme than in hemizygotes. class II - hypomorph - retains prothoracic and A7 segments
Phenotypic class V hb allele.