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Schematic representation of metal‐phenolic network capsules (MPNHA‐PEG) assembly consists of hyaluronic acid (HA) and poly(ethylene glycol) (PEG) with three different HA/PEG ratios (A). HA enhances targeting and binding to CD44+ (cancer cell line, blue) while PEG minimizes nonspecific binding to CD44− (pink) cells (B). Reprinted with permission from Ref. 260, Copyright 2016 American chemical society.
