highly significantp < 0.0001
However, when we transiently expressed a constitutively active form of Rab8a, using the same promoter (t aCP:mCherry-Rab8aCA ), we observed highly significant rescue of OS development in the mutant PRs expressing this transgene (Fig. 6D–D’ and red circles in E, p < 0.0001, Student’s t -test), with a majority of expressing PRs now displaying a nicely elongated OS.