Imprecise excision of the progenitor insertion, resulting in a deletion of approximately 0.9kb in the direction towards the mbl gene.
mblchst/mblchst-exS31 females show normal sexual receptivity.
Complements the reduced female sexual receptivity phenotype of mblchst.
mblchst-exS31 fails to complement the lethality of mblk05507b, mblE27, mblE127 and mblchst-exC3.