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Poly(ethylene glycol)-maleimide (PEG-Mal) was functionalized with (a) thiol thymine (T-SH) and (b) thiol adenine (A-SH); (c) Schematic of the biological self-assembly of ideal four-arm PEG hydrogel network via intermolecular nucleobase interaction between thymine and adenine functionalities [103]. Reproduced with permission. Copyright Royal Society of Chemistry, 2012.
