For example, the presence of increased numbers
of immature white blood cells, called band neutrophils or bands for short, indicate a serious infection.
In one type of refractory celiac disease, called RCDII,
immature white blood cells from the immune system (called lymphocytes) which are located in the wall of the small intestine, multiply in number in an uncontrolled manner.
Blast cells are
the immature white blood cells that become abnormal and accumulate in the bone marrow and blood in cases of leukemia.