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The Met790 side chain of the G719S / T790M double mutant , in the apo form and gefitinib - and AMPPNP - bound forms , adopts different conformations that explain the accommodation of these ligands .
 Chemical: Met790; 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: Met790; Chemical: gefitinib