The chemical reaction that results in bioluminescence requires two unique chemicals: luciferin and either luciferase or photoprotein. When luciferase binds to a chemical called luciferin. The interaction of the luciferase with oxidized (oxygen-added) luciferin creates a byproduct, called oxyluciferin. This reaction requires energy and releases light. The luciferase speeds up the reaction, which occurs in two steps:
The luciferin-luciferase chemical reaction has been used to measure the amount of ATP produced in cells.