3714
In tumor cells , activated RAS - GTPase , the founding member of the gene family , down - regulates the expression of the pro - apoptotic gene FAS via epigenetic DNA - methylation by DNMT1 .
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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:
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