posterior retina. The RPE forms the blood-retinal barrier and is
responsible for selective transport of materials from the underlying
vasculature (choriocapillaris) and the apical photoreceptors. Taurine transport
into the RPE and photoreceptors is, of course, critical to maintain integrity of
the neural retina. The RPE have a high-affinity and low-affinity transporter
(Kundaiker et al. 1996). Uptake of taurine in frog retina is sodium-dependent
(Lake et al. 1975; Lake et al. 1977). Using cell culture techniques, in addition
to a human RPE cell line, TauT is found in rat ganglion cells and Müller cells
(El-Sherbeny et al. 2004).