6677
These molecular weights are shown to be suitably high to afford robust hydrogel matrices and at the same time suitably low to allow gradual erosion of the hydrogels with kinetics of degradation controlled via polymer macromolecular characteristics .
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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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