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Semova and Rawls chemically bonded fluorescent molecules to two common fatty acids, palmitic acid pentanoic acid, and mixed the glowing fats into the egg yolk of embryonic zebrafish.

A patient chemist might have concocted the magic potion: old perspiration reactivated by new; a hint of stagnant water; various industrial lubricants and detergents; cheap scents from a dispensing machine; a selection of hydrocarbons and carboxyls, and, dominating the other smells, pentanoic acid, from brakes and human warmth, which occurs naturally in valerian.