27583
This study 1 ) examines epitope recognition in DR3 transgenic mice immunized to hTSH - R protein , and 2 ) evaluates ability of a mutant hTSH - R peptide to attenuate immunogenicity of hTSH - R peptide 37 . DR3 transgenic mice were immunized to recombinant hTSH - R - ECD protein or peptides .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None