lucifer 66.6 from the Latin lucifer, “light-bearer” “Luciferins typically undergo an enzyme-catalyzed reaction with molecular oxygen. The resulting transformation, which usually involves splitting off a molecular fragment, produces an excited state intermediate that emits light upon decaying to its ground state. The term may refer to molecules that are substrates for both luciferases and photoproteins.” H/T: anons NV9GCFiT, LLpA8xk3 Main Image Credit: Live Science 17,577 views