Mammals with starchy diets—us, dogs, and rats, as opposed to, say, hedgehogs and mountain lions—appear to have adapted, genetically, to stomach more carbs.

Studying E. coli at neutral pH in the lab might not give us a full sense of their powers against antibiotics.

For nearly 30 years, researchers have tried to understand how one enzyme produces a powerful antibiotic. Now they've figured it out.

To halt cancer's spread through the body, scientists are targeting an enzyme that sits on tumor cells.