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Phage display selection Zn-binding peptides. (A) Schematic diagram illustrating the whole biopanning procedure against Zn (II). Zn(II)-binding heptapeptides were identified through one round of reverse selection against blank resin of IDA and four rounds of selection against immobilized Zn(II) resin. (B) The binding affinity of PZn peptide toward different metals. (C) TEM micrographs of PEG/CS NPs and PEG/CS-PZn NPs. Reprinted with permission from 62.
