5715
For this purpose, 81 pentadecamer peptides covering the complete 491-amino-acid sequence of IE-1 were tested on peripheral blood mononuclear cells of anti- HCMV immunoglobulin G-seropositive donors .
 ( protein: IE-1, None) , ( protein: 491-amino-acid sequence, None) , ( cell type: peripheral blood mononuclear cells, 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:
 ( protein: IE-1, None) , ( protein: 491-amino-acid sequence, None) , ( cell type: peripheral blood mononuclear cells, None) 