Co-crosslinked phosphorylated hydrogel of polysaccharides, based on (i) dextran and (ii) hyaluronic acid and / or one of its salts, optionally functionalized, in which hydrogel said dextran and said hyaluronic acid (and / or its salt, optionally functionalized) are linked together by covalent bonds phosphodiesters and / or polyphosphodiesters.
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