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The generality of this finding was confirmed by the induction of Bcl-xL in human myeloid U-937 cells , human peripheral blood monocytes exposed to phorbol ester , and mouse thioglycollate-activated and resident peritoneal macrophages .
 Bcl-xL, mouse thioglycollate-activated and resident peritoneal macrophages, human myeloid U-937 cells, human peripheral blood monocytes
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:
 Bcl-xL, mouse thioglycollate-activated and resident peritoneal macrophages, human myeloid U-937 cells, human peripheral blood monocytes