. "Catalysis of the transfer of branched-chain amino acids from one side of a membrane to the other. Branched-chain amino acids are amino acids with a branched carbon skeleton without rings." . . "valine/tyrosine/tryptophan permease activity" . "leucine/valine/isoleucine permease activity" . "branched-chain amino acid transmembrane transporter activity" . "branched-chain aliphatic amino acid transmembrane transporter activity" . "branched-chain aliphatic amino acid transporter activity" . . . . . . . .