. . . . . . . . . . . . "gamma-aminobutyric acid:proton antiporter activity"@en . "C5673047" . . . . . "GO:0140800" . "gamma-aminobutyric acid:proton antiporter activity"@en . "gamma-aminobutyric acid:proton antiporter activity"@en . . . . "Enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: 4-aminobutanoate(out) + n H+(in) = 4-aminobutanoate(in) + n H+(out)."@en .