1839
A salient difference between solution and crystal structures is observed in the C-terminal segment of alpha-helix 3 (the HTH recognition helix ), which is not well ordered in solution.
 ( protein: C-terminal segment, None) , ( protein: alpha-helix 3, None) , ( protein: HTH recognition helix, 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: C-terminal segment, None) , ( protein: alpha-helix 3, None) , ( protein: HTH recognition helix, None) 