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doi: 10.1016/j.yrtph.2015.06.016, 222

If the substance is no longer needed, enzymes such as diamine oxidase (DAO) in the intestine, tissue and blood, or histamine N-methyltransferase (HNMT) in the liver, bronchial mucosa and central nervous system ensure that it is broken down

Journal of Microbiology and Biotechnology

The majority of QIs was reduced back to the respective parent compound (50% of AQ-QI and 80% of DEAQ-QI), presumably by the action of endogenous antioxidants and/or reductases, e.g., quinone reductases ( Figure 5B )

doi: 10.1016/S2213-2600(20)30105-3

pH 7.4) containing 1.25% 3,3-diaminobenzidine (DAB: Merck KGaA, Darmstadt, Germany) and 0.75% hydrogen peroxide