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ai generated group immune system hematology biology blood health cells body microscopic medical response human circulatory physiology plasma platelets leukocytes erythrocytes leukocytosis hemoglobin oxygen infection defense pathogens immunity antibodies phagocytes lymphocytes antibody production vessels capillaries veins arteries microorganisms antigens bacteria viruses elimination organ tissues bone marrow spleen thymus lymph nodes macrophages neutrophils eosinophils