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Because the translation rate is an important determinant of cell proliferation , we have investigated translation initiation during human myeloid cell differentiation using the HL-60 promyelocytic leukemia cell line and the U-937 monoblastic cell line .
 U-937 monoblastic cell line, human myeloid cell, HL-60 promyelocytic leukemia cell line
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:
 U-937 monoblastic cell line, human myeloid cell, HL-60 promyelocytic leukemia cell line