Microbial species that are commonly associated with oral diseases in modern humans are unreliable proxies for determining tooth health status in ancient samples, a new study finds.

A hormone treatment contaminated with amyloid-β given to mice caused the protein’s accumulation in their brains, suggesting the same could have occurred in humans given the therapy.

In a clinical trial, patients on the highest injected dose had 30 percent less cognitive decline over time than people on a placebo.

Making macrophages in atherosclerotic plaques digest spent organelles instead of dying may help keep plaques stable.