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; protein: alpha-helix 3; protein: HTH recognition helix
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: C-terminal segment, alpha-helix 3, HTH recognition helix 
Answer:
 protein: C-terminal segment; protein: alpha-helix 3; protein: HTH recognition helix