A team led by researchers at Kiel University has found that tumors can occur naturally in Hydra, suggesting that "spontaneous tumors have deep evolutionary roots" as they wrote in Nature Communications earlier this summer.

They examined polyps from Hydra oligactis and Pelmatohydra robusta that had altered morphology and tumor-like properties, including the ability to be established as a clonal line.

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In Nature this week: Icelandic genome sequences, approach to increase CRISPR efficiency, and more.

Testing showing "genetic incompatibilities" have led thousands of couples in Saudi Arabia to call off their weddings, the BBC reports.

Decode Genetics' ability to tell Icelanders, even ones the company hasn't sequenced, about their disease risk brings up ethical questions.

Genetic analysis of Britain's King Richard III and modern descendants of his relatives indicate breaks in the male line.