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In addition, RNase protection assays revealed that anti-CD3/ PMA -stimulated T cells from a substantial proportion of elderly subjects exhibited decreased levels of c-fos and/or c-jun mRNA compared to T cells from young subjects .
 PMA -stimulated T cells, T cells, RNase
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:
 PMA -stimulated T cells, T cells, RNase