8717
X - ray crystallography revealed two conformations of Arg - 234 and Ser - 130 in SHV K234R .
 Chemical: Arg; Chemical: Ser
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Arg; Chemical: Ser