red blood cells seamless pattern. hand drawn erythrocytes. scientific biology in sketch style

cell seamless pattern background erythrocyte blood microscope biology texture abstract human disease medical science microbiology red small anemia infection dot sickle microbe vector plasma micro experiment scientific life stem white macro sketch hand drawn drawing ink pencil etch engraving vintage line art design decor wrapping paper print textile fabric wallpaper ornament cells erythrocytes style pattern erythrocytes style