The αTub84B promoter drives expression of the Cbl S isoform, mutated to carry a C369A amino acid replacement.
CblRing.S.αTub84B fails to rescue CblF165
Lethality due to CblF165/CblF165 is not rescued by CblC369A.SαTub84B.PJ and neither is the border cell migration defect seen in CblF165 homozygous somatic clones.