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Mammals diversified 30 million years later than previously estimated, according to a new analysis of an ancient fossil.

A protein complex discovered in Drosophila may be capable of sensing magnetism and serves as a clue to how some animal species navigate using the Earth’s magnetic field.

The creation of a chimeric SARS-like virus has scientists discussing the risks of gain-of-function research.

Scientists identify a barrier in mice between the intestine and its blood supply, and suggest how Salmonella sneaks through it.

Researchers use CRISPR to create plants that resist infection by DNA viruses.

Some antibodies designed to eliminate the plaques prominent in Alzheimer’s disease can aggravate neuronal hyperactivity in mice.

A new American Museum of Natural History exhibit introduces visitors to the microbes within their bodies. 

Gut microbiome composition can influence the effectiveness of cancer immunotherapy in mice.

Deficiency in a protein called pejvakin makes inner ear cells more vulnerable to sound, unable to brace themselves against oxidative stress stimulated by noise. 

Monarch and queen caterpillars store toxic compounds from their milkweed diet to ward off predators into adulthood, a new study suggests.

The virus can persist in several tissues where the immune system is less active. Researchers are working to better understand this phenomenon and how it can stall the clearing of Ebola in survivors.

Resecting a majority of the small intestine—a popular weight-loss surgery half a century ago—led to severe malnutrition and eventual death.