putrescine + NADPH + O2 <=> N-hydroxyputrescine + NADP(+) + H2O
putrescine + nadph + o2 <=> n-hydroxyputrescine + nadp(+) + h2o
putrescine + NADPH + O2 <=> N-hydroxyputrescine + NADP(+) + H2O
putrescine + nadph + o2 <=> n-hydroxyputrescine + nadp(+) + h2o