very closely observed white blood cells,called leukocytes in the human body

abnormal allergen allergens antibodies antibody artery biological biology blood bloodstream body cancer cardiovascular cell cells cellscalled circulation circulatory closely closeup components composition diagnosis erythrocyte examination fighting flow group healing hemoglobin human illness illustration immune immunology killer leukocyte leukocytes lipids magnification medicine microbiology microscope microscopic observed organic organism pathology plasma red rendering scientific secluding serum system very virus white woundhealing