red blood cells tile able seamless

red blood cells tile seamles type cell bone marrow found protein called hemoglobin carries oxygen lungs parts body seamless microscope molecule hemophilia cell infection circulation lymphocyte bloodstream scientific artery vein body microorganism blood medical erythrocyte red microbiology human life science biology white disease macro background anemia hand drawn sketch plasma etch hematology pencil ink vector hemoglobin drawing platelet micro cardiovascular medicine