Fig. 6. Models for asymmetric localisation of planar polarity proteins. (A) We propose that initial apicolateral recruitment of planar polarity proteins occurs according to the hierarchy shown (see text for details). (B) During the early stages of asymmetric complex formation, planar polarity proteins are apicolaterally localised but not obviously asymmetrically distributed on the proximodistal axis. At this stage, they may either be in symmetric complexes in which the same proteins are present on both sides of the cell-cell boundaries (left) or asymmetric complexes that are randomly orientated relative to the proximodistal axis of the wing (middle). Ultimately, the pattern resolves to that shown (right). Proteins represented are Fmi (red), Fz (green), Dsh (blue circles), Stbm (yellow) and Pk (purple circles).