Required for the planar polarity of actin filament orientation at the basal side of ovarian follicle cells (PubMed:19906848, PubMed:23369713). Required for proper egg chamber shape and elongation of the egg chamber during oogenesis (PubMed:19906848, PubMed:23369713). Required for the correct planar polarization of Rab10 within the basal follicle cell epithelium and is therefore indirectly involved in the Rab10-dependent remodeling of the basal membrane during egg chamber elongation (PubMed:23369713). Accumulates on cell membranes where the planar oriented actin filaments terminate. Localizes where basal actin filaments terminate. Defects in actin filament orientation correlate with a failure of egg chambers to elongate during oogenesis (PubMed:19906848). In follicle cells, Rab10 protein polarizes normally along the apical-basal axis, but is mislocalized within the epithelial plane (PubMed:23369713). Epithelia migration is impaired and the structure of the basal membrane is disrupted (PubMed:23369713). Truncated N-terminus. Truncated N-terminus. Contaminating sequence. Potential poly-A sequence.