Apamin TFA (Apamine TFA) is a toxin found in bee venom. It is a potent blocker of small conductance Ca2+-activated K+ (SK, KCa2) channels that is more effective at SK2 than SK1 and SK3.

Acifluorfen, a protoporphyrinogen oxidase (PROTOX) inhibitor herbicide, promotes the accumulation of protoporphyrin IX (PPIX), and induces tumors in the rodent liver. Acifluorfen causes strong photooxidative destruction of pigments and lipids in sensitive plant species.

NADH is the reduced form of nicotinamide adenine dinucleotide (NAD) that can donate electrons as part of a reducing reaction. In that process NADH becomes oxidized to produce NAD+. A variety of enzymes use NADH plus H+ to reduce substrates generating NAD+ as well as the reduced product.