1.2.3.14 cyanide the ability of AAO1 and AAO3 to reduce 2,6-dichloroindophenol is abrogated when the enzymes are pre-treated with cyanide, NADH oxidation activity of AAO1 and AAO3 is highly sensitive to cyanide treatment 118 1.2.3.14 diphenylene iodonium DPI i.e. diphenylene iodonium, in the presence of DPI aldehyde oxidation activities of AAO1 and AAO3 are strongly reduced to 1–16%, NADH oxidation activity of AAO1 and AAO3 is highly sensitive to DPI treatment 1616 1.2.3.14 diphenyleneiodonium 16% residual activity at 0.05 mM 4422 1.2.3.14 estradiol 60% residual activity at 0.1 mM 897 1.2.3.14 menadione 78% residual activity at 0.1 mM 240 1.2.3.14 methanol complete inhibition at 2% (v/v) 83 1.2.3.14 additional information not inhibited by iodoacetamide and ethanol 2 1.2.3.14 p-hydroxymercuribenzoate 62% residual activity at 0.1 mM 98 1.2.3.14 potassium cyanide 13% residual activity at 1 mM 2095