. . . . . . . . "Proton donor" . "20"^^ . . "20"^^ . . "An active site occurs in NX_Q9BWV3-4 at amino acids 20 - 20." . . . . . "neXtProt gold" . . . . . . . . . "2014-09-19T00:00:00.0Z"^^ . . . "neXtProt database" . "CALIPHO project" . . . . . "1" . . .