WNK3 and Abnormal retinal morphology: Drosophila PRs provide a tractable system in which to explore this phenotype in detail as, despite significant morphological and biochemical differences with mammalian PRs (e.g., microvillar as opposed to ciliary membrane expansion), they were used to first identify the mechanisms responsible for mammalian retinal diseases (Colley et al., 1995, Kurada and O'Tousa, 1995) and also undergo extensive membrane remodeling during development.