UASp regulatory sequences drive expression of a truncated form of chb that lacks the TOG2 domain.
chbΔTOG2.UASp/Scer\GAL4ppk.PU fails to rescue chb4
chbΔTOG2.UASp/Scer\GAL4477 fails to rescue chb4/chb464
chbΔTOG2.UASp/Scer\GAL4ppk.PU fails to rescue chb4/chb464