3.5.1.54 urea cycle urea cycle - - 3.5.1.54 Arginine biosynthesis - 00220 - 3.5.1.54 Atrazine degradation - 00791 - 3.5.1.54 Metabolic pathways - 01100 - 3.5.1.54 Microbial metabolism in diverse environments - 01120 -