20291
The two others peptides ( BoP1 and BoP2 , 4093 Da and 4121 Da , respectively ) only differ by a Lys / Arg mutation .
 Chemical: Lys; Chemical: Arg
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: Lys; Chemical: Arg