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In conclusion, our data suggest the involvement of the Jak/Stat signal pathway in MHC-I -induced signal transduction in T cells .
 MHC-I, T cells, Jak/Stat
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:
 MHC-I, T cells, Jak/Stat