1763
Both fragments contain the entire ligand binding domain , and the 35-kDa fragment extended into the hinge region of the receptor.
 protein: 35-kDa fragment; protein: ligand binding domain; protein: hinge region
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: 35-kDa fragment, ligand binding domain, hinge region 
Answer:
 protein: 35-kDa fragment; protein: ligand binding domain; protein: hinge region