blood cell

When people donate blood, stem cells in the bone marrow make new blood cells to replace the lost blood - and this could shape the stem cells' genetic diversity.

Untreated, the clots cause organ damage and low red blood cell and platelet counts.

Part of our immune defences - a white blood cell called a T-cell - can swoop in and destroy the spreading cancer as it tries to take root.

The condition occurs at pregnancy when the mother's red blood cells are incompatible with that of their growing baby.

White blood cells – which could produce antibodies or attack infected tissue – move out of their normal homes and head out on patrol thinking there could be an infection.