| http://www.w3.org/ns/prov#value | - a) providing a cell or tissue; b) enclosing said cell or tissue within at least one encapsulating material, such as a hydrogel, made of physically or chemically crosslinkable polymers, including polysaccharides such as alginate, agarose, chitosan, poly(amino acids), hyaluronic acid, chondroitin sulfate, dextran, dextran sulfate, heparin, heparin sulfate, heparan sulfate, gellan gum, xanthan gum, g
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