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Leukocytes - Agranulocytes Three agranular leukocytes: B-Lymphocyte, T-Lymphocyte, and Macrophage. Red blood cell (upper left) for size comparison to white blood cells. Red Blood Cell B-Lymphocyte T-Lymphocyte Macrophage LifeART Collection Images Copyright © 1989-2001 by Lippincott Williams & Wilkins, Baltimore, MD