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Leukocytes and their functions

The Immune Response Features a Specialized Array of Cells and Proteins Immunity is brought about by a variety of leukocytes (white blood cells), including macrophages and lymphocytes, all developing from undifferentiated stem cells in the bone marrow. Leukocytes can leave the bloodstream and patrol the tissues, each cell producing one or more proteins capable of recognizing and binding to molecules that might signal an infection