14748
DNA methylation plays an important role in suppressing retrotransposon activity in mammalian genomes , yet there are stages of mammalian development where global hypomethylation puts the genome at risk of retrotransposition - mediated genetic instability .
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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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