UASt regulatory sequences drive expression of Abd-B-m carrying mutation of the S residue in the stretch of amino acids flanking the homeodomain N-terminally (EWTGQVS).
Scer\GAL4Abd-B-MD761/Abd-BS.UAS partially rescues Abd-BMD761/Abd-BM1
Abd-BS.UAS/Scer\GAL4Abd-B-LDN fails to rescue Abd-BM1/Abd-BLDN