22956
Thermoreversible hydrogels were evaluated by gelation temperature , viscosity over the temperature range 20 - 40 degrees C , rate of hydrogel dissolution , and heparin release in vitro .
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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:
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