5662
The Ala -substituted peptide was recognized by the T cell clone at neutral pH only when it was present in the APC culture throughout the stimulation process.
 ( cell type: APC, None) , ( cell line: APC culture, None) , ( cell line: T cell clone, 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 type: APC, None) , ( cell line: APC culture, None) , ( cell line: T cell clone, None) 