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In this study , we investigated whether theaflavins ( TFs ) affect the absorption of small peptides in human intestinal Caco - 2 cells , since TFs do not penetrate through the cells and might be involved in intestinal transport systems .
 Chemical: theaflavins; Chemical: TFs; Chemical: TFs
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: theaflavins; Chemical: TFs; Chemical: TFs