This Week in Science

In this week's Science, researchers from the Icahn School of Medicine at Mount Sinai report on the discovery of a network of genes that appears to play a key role in fostering cooperation between cells during the evolution of multicellular organisms.

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

A retrovirus that's been integrated into the human genome appears to have a role in embryonic development, researchers report.

A report from MIT identifies areas of scientific research where declining research support is hindering needed advances.

In PLOS this week: phylogenetic study of hepatitis E viruses in Swedish moose, recombination sites in the honeybee genome, and more.