Expression of the Mbs ORF (from cDNA AT12677) is under the control of a heat shock promoter.
ring canal, with Mbs03802
Homozygous Mbs03802 flies expressing Mbshs.PT at the start of embryogenesis (to rescue lethality) are fertile. Depletion of Mbshs.PT results in the formation of small ring canals at stage 10 but has no effect on the number of mitotic divisions or on the morphology of the fusome network. In contrast, the scra-stained nascent ring canals in the homozygous mutants are significantly smaller than the corresponding rings in the heterozygous flies at cyst stage IV-f, prior to ring canal growth.