| http://www.w3.org/ns/prov#value | - A controlled release composition according to claim 2, wherein said cross-linked gelatin is obtained by redox polymerisation or radical polymerisation initiated by an initiator selected from the group of a type I photo-initiator, a type II photo-initiator, an organic peroxide such as benzoyl peroxide, and mixtures such as a mixture of potassium peroxodisulfate and N,N,N???,N??? tetramethylethyened
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