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Notably , the introduction of the F723A mutation greatly enhanced the gefitinib sensitivity of the wild - type EGFR in vivo , supporting our hypothesis that the expansion of the active - site cleft results in enhanced gefitinib sensitivity .
 Chemical: gefitinib; Chemical: gefitinib
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: gefitinib; Chemical: gefitinib