Epithelia are polarized along the apical–basal axis in order to allow for directional transport of proteins within a cell or secretion of factors into. In addition, most epithelia are also polarized within the epithelial plane. The latter polarization is called epithelial PCP (Planar Cell Polarity) or tissue polarity. Planar polarization provides a cell not only with positional information but also directional (vectorial) information and correct PCP is a prerequisite for the formation of many organs. PCP, however, is be...
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