8037
Markedly impaired binding was observed, consistent with both the use of different anchor residues and with changes in levels of DQ cis- dimer availability for peptide binding interactions .
 ( protein: dimer, 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: dimer, None) 