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The superporous hydrogel containing poly(acrylic acid-co-acrylamide)/O-carboxymethyl chitosan (O-CMC) interpenetrating polymer networks (SPH-IPN) that had been developed as an oral delivery vehicle for protein drugs was subject to cytotoxicity and genotoxicity testing, thus evaluating its biological safety in use. In a battery of cytotoxicity assays on RBL-2H3 and Caco-2 cells, the SPH-IPN caused...
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