3.5.3.11 dithiothreitol the enzyme requires the presence of dithiothreitol for maximum activity 726980 3.5.3.11 L-arginine but it inhibits at concentrations about 14 mM agmatine 246677 3.5.3.11 L-ornithine but it inhibits at concentrations about 14 mM agmatine 246677 3.5.3.11 putrescine but it inhibits at concentrations about 14 mM agmatine 246677