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Structural analyses of the G719S / T790M double mutant , as well as the wild type and the G719S and L858R mutants , revealed that the T790M mutation stabilizes the hydrophobic spine of the active EGFR - TK conformation .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None