Extended Data Fig. 6: Structures of FAD and Riboflavin.
From: Essential elements of radical pair magnetosensitivity in Drosophila

The molecular structure of the two flavin chromophores used. (a). Flavin Adenine Dinucleotide (FAD). Note the adenine diphosphate side chain of FAD (yellow oval), which facilitates the generation of an intramolecular, magnetically-sensitive RP. (b). Riboflavin, which is a metabolic precursor to FAD lacks the diphosphate side chain.