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We examined the contribution of the two isoforms of STAT5 , STAT5A and STAT5B , to IL-2- and IL-7- induced activation of human peripheral blood T lymphoblasts .
 human peripheral blood T lymphoblasts, STAT5A, STAT5B, STAT5
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:
 human peripheral blood T lymphoblasts, STAT5A, STAT5B, STAT5