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During the inflammatory response increased levels of PGE2 bind to their receptors on T cells and thus alter responsiveness.
 cell type: T cells
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: T cells 
Answer:
 cell type: T cells