mixed mature white blood cells on red blood cells background

anatomy background basophil biology blood body cell cells diagram disease eosinophil erythrocyte granules granulocyte health healthy hematology hemoglobin human illustration immune infection killer laboratory leukemia leukocyte lymphocyte marrow medical medicine microbiology microscope monocyte neutrophil nucleus phatocytosis platelet platelets science scientific smear stem structure symbol system thrombocytes vascular white