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A mouse model has been created providing the first in vivo evidence that epigenetic alterations alone can cause cancer. Epigenetic alterations don’t change the DNA sequence but how it is ‘read.’ In particular, DNA methylation, the addition of a methyl group (or molecule), is an epigenetic switch that can stably turn off genes, suggesting the potential to cause cancer just as a genetic mutation can. Until now, direct evidence that DNA methylation drives cancer formation was lacking.