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iver rsity revi e 1 all the hair cells point to the periphery of the cochlea, displaying a distinctive planar cell polarity (PCP) (Gubb and Garcia-(CE) (Keller, 2002) concurrently with the establishment of PCP from embryonic day 14.5 (E14.5) to E18.5 (Chen et al., 2002; McKenzie et al., 2004; Wang et al., 2005). Genetic studies in Drosophila have identified a set of so-The mammalian auditory sensory organ, the organ of Corti, consists of four rows of sensory hair cells interdigitated with supporting cells along the length of the spiral cochlear duct. The innermost row of cells toward the center (medial aspect) are th