A Na+-dependent neutral and cationic amino acid transport system (B 0+) plays an
important role in many cells and tissues; however, the molecular basis for this transport
system is still unknown. To identify new transporters, the expressed sequence tag database
was queried, and cDNA fragments with sequence similarity to the Na+/Cl−-dependent
neurotransmitter transporter family were identified. Based on these sequences, rapid
amplification of cDNA ends of human mammary gland cDNA was used to obtain a cDNA of …