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Several cell lines of hematopoietic origin including the leukemic T cell line HPB.ALL and the erythroleukemic cell line K562 were responsive to thrombin , whereas others such as THP1 , a myelomonocytic cell line , and BL2, a Burkitt lymphoma were refractory to thrombin or TRP stimulation.
 THP1, BL2,, erythroleukemic cell line K562, thrombin, Burkitt lymphoma, thrombin, leukemic T cell line HPB.ALL, myelomonocytic 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:
 THP1, BL2,, erythroleukemic cell line K562, thrombin, Burkitt lymphoma, thrombin, leukemic T cell line HPB.ALL, myelomonocytic cell line