6678
For opportunities in controlled drug release , hydrogels are equipped with enzymatic cargo to achieve an in situ conversion of externally added prodrug into a final product , thus giving rise to surface - adhered enzymatic microreactors .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None