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Two new studies in Genome Research have implicated the microbe Fusobacterium nucleatum in the development of colorectal cancer, says Medscape News' Derek Cassels. Using metagenomic techniques, the two teams analyzed the pathogens present in colorectal cancer samples, and both found that F. nucleatum was the most differentially abundant between cancer tissues and healthy tissues, Cassels says, ranging from 0.1-fold to 256-fold, with a mean of 79-fold overabundance.

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Differences in DNA methylation could be used to distinguish between DNA samples obtained from identical twins, researchers say.

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