Figure 1: Molecular formulae of the peptides used in this study.
From: Supramolecular amplification of amyloid self-assembly by iodination

The natural peptide DFNKF was modified by halogenation on the phenylalanine residues in the para position. Modifications are shown in the peptide sequence in brackets where F(I) denotes 4-iodophenylalanine, F(Br) denotes 4-bromophenylalanine and F(Cl) denotes 4-chlorophenylalanine.