This compound is produced by a tetrameric enzyme with an iron or manganese active site, which is expressed sevenfold more in termite queens than in workers. A C-terminal SKL (“s-k-l”) sequence localizes proteins to a structure where FAD (“f-a-d”) is a (15[1])cofactor for generating this compound. Luminol reacts with this compound (15[1])in ECL reagent (15[1]-5[1])to allow imaging (-5[1])of western blots. This (-5[1])compound is produced by a structure that is defective in (*) Zellweger (-5[1])syndrome, (10[1])and it partially names (10[1]-5[1])a (10[1])chemiluminescent (-5[1])enzyme isolated from horseradish. Mitochondrial (10[1])SOD2 remediates (10[1])stress from the ETC by generating this compound, which is metabolized in an eponymous organelle that exclusively (10[1])oxidizes (10[3])branched and very-long-chain (-5[1])fatty acids. For 10 points, catalase breaks down (10[1])what (10[1])compound (-5[1])stored in dark bottles (10[1])into water and (10[1])oxygen? (10[1])■END■ (10[10]0[7])