The glucose in the blood reacts with an enzyme electrode containing glucose oxidase (or dehydrogenase).

The enzyme was originally discovered by Mary Bernheim in the liver and was named tyramine oxidase.

Chronic granulomatous disease (CGD) a deficiency in NADPH oxidase enzyme, which causes failure to generate oxygen radicals.

But the thing about tryptamines is they cannot be taken orally because they're denatured by an enzyme found naturally in the human gut called monoamine oxidase.

Examples An important example is cytochrome c oxidase, the key enzyme that allows the body to employ oxygen in the generation of energy and the final component of the electron transfer chain.

The most sensitive targets of NO are aconitase, an enzyme that catalyzes the isomerization of citrate to isocitrate in the citric acid cycle, and cytochrome oxidase, the last enzyme in the respiratory electron transport chain of mitochondria.