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Caption : figure s1. the synthesis scheme of dxvs and zwitterionic pcdx. 

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Caption : figure s2. the relationship between the dm of vs on dx with time .

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Caption : figure s3. the chemical structure and 1h-nmr spectra of a) vs functionalized dx, b) mpc, c) thiolated mpc, mpc-sh and d) dx modified with pc. 

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Caption : figure s4. the synthesis scheme -oac functionalized dx and charge derivatives. 

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Caption : figure s5. the chemical structure and 1h-nmr spectra of -oac functionalized a) dextran (dx-oac), b) carboxymethyl dextran (cmdx-oac), c) diethyl aminoethyl dextran (dedx-oac) and d) phosphorylcholine-decorated dextran (pcdx-oac). 

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Caption : figure s6. representative flow cytometry flow from c57bl\6 mice tissue samples post hydrogel injection, showing gating strategy.

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Caption : figure s7. scanning electron microscope images of a) dx, b) dedx, c) cmdx and d) pcdx. 

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Caption : figure s8. the swelling behavior of degradable -oac modified dx, cmdx, dedx and pcdx bulk hydrogels.