SLC6A6, also known as TAUT, belongs to the neurotransmitter transporter family and transports taurine in a Na+- and Cl–-dependent manner. Taurine is involved in many important physiological processes, including antioxidation, osmolarity regulation, and proper maintenance of the functions of the liver and skeletal muscles. Since fetuses and neonates cannot independently synthesize taurine, they depend on taurine supplied through the placenta and breast milk of their mothers for their development. According to a recent report, rat SLC6A6 also appears to transport another neurotransmitter, namely, GABA, across the inner blood-retinal barrier.