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After site - saturation mutagenesis of Lys - 234 in SHV , microbiological and biochemical characterization of the resulting beta - lactamases revealed that only - Arg conferred resistance to ampicillin / clavulanate .
 Chemical: Lys; Chemical: Arg; Chemical: ampicillin; Chemical: clavulanate
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; Chemical: ampicillin; Chemical: clavulanate