SLC12A5 and breast cancer: Similarly, the dendrite and axon of ON bipolar cells preferentially express NKCC and KCC2, respectively (Vardi et al., 2000; Duebel et al., 2006), resulting in a depolarization action of synaptic inputs from horizontal cells to BC dendrites and a hyperpolarization action of synaptic inputs from amacrine cells to BC axons.