2.5.1.53 uracilylalanine synthase; O3-acetyl-L-serine acetate-lyase (adding uracil); isowillardiine synthase; willardiine synthase; 3-O-acetyl-L-serine:uracil 1-(2-amino-2-carboxyethyl)transferase; O3-acetyl-L-serine:uracil 1-(2-amino-2-carboxyethyl)transfer • • •