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In this study, we investigated the regulation of costimulation-induced mitogen-activated protein kinase ( MAPK ) activation in primary mouse T cells .
 MAPK, mitogen-activated protein kinase, primary mouse T cells
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 MAPK, mitogen-activated protein kinase, primary mouse T cells