biology blood capillary cells education haemoglobin human laboratory life microscope microscopy oxygen red red blood cells science slide smear tiny garden grass grasses japanese Japanese blood grass ornamental plants abstract background blood cells body carbon dioxide cell count circulation concept corpuscle design disease erythrocyte fill graphic health hemoglobin illness iron macrocyte medicine megaloblast megalocyte microscopic New original platelets render sickness style texture transfusion unique vector Bleed bleeding blood drops blood stain bloody cleaning crime drops harm hurt hygeine injury jesus lifeblood murder spatter splatter stains wound wounded 3D coagulation gore gory halloween hygiene old blood paint fresh blood
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