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In contrast , the latter pathway likely involves MHC binding peptides displayed as a consequence of abacavir exposure , but not abacavir itself .
 Chemical: abacavir; Chemical: abacavir
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: abacavir; Chemical: abacavir