From the moment they’re born, newborns — or, specifically, their immune systems — must learn to fight germs without harming their own tissues. In a new study, Yale researchers found that one type of ...

Eosinophils are a type of white blood cell that help ward off bacteria, viruses, parasites, and other possible causes of infection. Eosinophil levels may rise when a person has an allergy, an ...

The team used human stem cells to create embryo-like structures dubbed “hematoids” that mirror some features of early human ...