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To directly address the role of OAT1 ubiquitination , we then generated two OAT1 mutants , each having multiple lysines ( K ) simultaneously mutated to arginine ( R ) .
 Chemical: lysines; Chemical: arginine
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: lysines; Chemical: arginine