14918
Hydrogel sensitivity was tested by exposure to MMP - 2 or MMP - 9 for 2 weeks , during which samples were taken to analyze protein loss from the hydrogel and release of 100 nm fluorescent beads .
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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