Poly(ethylene glycol)-poly(propylene sulfide) (PEG-PPS) hydrogels are injectable synthetic non-protease degradable hydrogels that allow cell spreading and proliferation in vitro and cellular infiltration in vivo. Further, this hydrogel promotes the survival of transplanted neural progenitor cells in the brain. PEG-PPS hydrogels form through a combination of hydrophobic interactions between the PPS domains and covalent bonds through disulfide exchange reactions of the polymer end groups.
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Zhang et al. (2011) studied this question.
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