moreover , recent work from my laboratory indicates that in vitro at alkaline ph in the presence of mg2+ , the biologically active diphenols ( beta-3,4-dihydroxyphenylalanine and the beta-adrenergic agonists isoproterenol , norepinephrine , and epinephrine ) appear to function as electron donor substrates for human erythrocyte catalase and inhibit the production of o2 from h2o2 at micromolar concentrations .
C0028351
norepinephrine
C0014563
epinephrine