25849
Moreover , our modeling study suggested that a single hydrogen bond formed between Vc1 . 1 and position 59 of the alpha 10 alpha 9 pocket confers specificity to rat versus human alpha 9 alpha 10 nAChRs .
 Chemical: hydrogen
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: hydrogen 
Answer:
 Chemical: hydrogen