The question of why females mate with multiple males has long puzzled evolutionary biologists. A new study of African ...

Scientists uncovered evidence that human blood cells may trace their origins back to single-celled ancestors that lived 700 million years ago. By rebuilding the evolutionary family tree of blood cells ...

B-cell chronic lymphocytic leukemia (CLL) occurs when abnormal B cells accumulate in the bone marrow and blood. This crowds out healthy blood cells and weakens the body’s ability to fight infections.

Blood cells carry a deep evolutionary history. A new analysis suggests their earliest ancestors were macrophage-like cells inherited from single-celled life. By tracing those lineages back 700 million ...