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Amino acid diagram of human FFA4-S with numbers relative to the initiating Met. The known sites of phosphorylation of FFA4-S are shown in orange while three acidic residues that contribute to the negative charge responsible for β-arrestin recruitment are shown in blue. The inset depicts additional 16 residues of FFA4-L, which changes the numbering scheme after Ile233 (short)/249 (long).
