2458
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.
 ( cell line: THP1, None) , ( cell line: BL2,, None) , ( cell line: erythroleukemic cell line K562, None) , ( protein: thrombin, None) , ( cell line: Burkitt lymphoma, None) , ( protein: thrombin, None) , ( cell line: leukemic T cell line HPB.ALL, None) , ( cell line: myelomonocytic cell line, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( cell line: THP1, None) , ( cell line: BL2,, None) , ( cell line: erythroleukemic cell line K562, None) , ( protein: thrombin, None) , ( cell line: Burkitt lymphoma, None) , ( protein: thrombin, None) , ( cell line: leukemic T cell line HPB.ALL, None) , ( cell line: myelomonocytic cell line, None) 