A fairly significant number of works are devoted to gelatin-immobilized proteases (see, in particular, [ 167 , 168 , 169 , 170 , 171 , 172 , 173 , 174 ]); there is a review article on this subject [ 175 ].
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The sentences
In recent years, there has been a clear trend in medical practice towards the use of targeted drug delivery based on gelatin modified with various functional groups, as well as composite materials with embedded gelatin carriers.