16522
In macrophage cultures , as well as upon implantation , a surface erosion process is observed for the amorphous ( co ) polymer networks , while an abrupt decrease in the rate and a change in the nature of the erosion process are observed with increasing crystallinity .
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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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