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After 24 h of culture on 3 - D fibrous PGE scaffolds , HAECs formed a confluent , nonthrombogenic , and physiologically competent monolayer , as assessed by tissue factor ( TF ) gene expression and protein activity assays .
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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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