A novel transporter polypeptide; a DNA encoding this polypeptide; a vector containing this DNA; a transformant transformed by this vector; a process for producing the above transporter polypeptide; an antibody reacting specifically with the polypeptide; a microorganism, an animal cell or an animal producing this antibody; a method for searching for a compound having a ligand activity by using the polypeptide, a part thereof or a microorganism, an animal cell, etc. with the expression of the same; and a method for searching for a compound regulating the expression of the gene of the polypeptide by using cells.
