Infectious, foreign, or cancerous cells are the primary targets of a healthy immune system.
White blood cells also known as leukocytes, play a vital role in the immune system. Immune cells are developed from stem cells in the bone marrow and can be divided into different types. Neutrophils, eosinophils, basophils, mast cells, monocytes, macrophages, dendritic cells, natural killer cells, and lymphocytes all are types of white blood cells.
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