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Peptides representing the three main categories of the secondary structures of AMPs. LL-37 and human lactoferricin represent α-helical peptides, human β-defensin 1 represents β-sheet peptides, and indolocidin represents extended/random-coil structures. Structures are from Protein Data Bank in Europe (PDB id codes 2k6o, 1z6v, 1kj5, and 1g89).
