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We investigated which STAT complexes are formed upon stimulation of B cell precursor acute lymphoblastic leukemia (BCP-ALL) cells with IL-7 .
 STAT complexes, B cell precursor acute lymphoblastic leukemia (BCP-ALL) cells, IL-7
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:
 STAT complexes, B cell precursor acute lymphoblastic leukemia (BCP-ALL) cells, IL-7