1477
The NS-Meg cells spontaneously produced platelet-like particles which contained alpha-granules , mitochondria and dense bodies , strongly suggesting platelet production .
 ( cell line: NS-Meg cells, None) , ( cell type: platelet-like particles, 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: NS-Meg cells, None) , ( cell type: platelet-like particles, None) 