Neutrophils are white blood cells important to fighting infections. A neutrophil count of lower than 1,500 per microliter of blood in an adult is neutropenia. As a vital part of the immune system, white blood cells are produced in the bone marrow. Normal total counts range from 4,000 to 11,000 per microliter. People with Felty's fall below this range despite actively producing white blood cells. Research suggests they have a significant number of white blood cells concentrated in the spleen.
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