Notes: BzF is a photoreactive derivative of the amino acid L-phenylalanine (Item No. 31498).{69115} It can be incorporated into synthetic peptides and used as a photolabel to cross-link the peptides to their protein binding partners to identify the residues involved in peptide-protein interactions. BzF has also been incorporated into G protein-coupled receptors (GPCRs) to identify potential ligand binding sites.{69116}