aids

alien

anatomy

artery

bacterium

barbed

biology

biotechnology

blood

bubble

cancer

cell

circulate

circulation

cloning

dangerous

disease

dividing

epidemic

erythrocyte

flow

fluid

foreign

health

hemoglobin

hiv

illness

infection

medicine

micro

microbe

microscopic

mitosis

molecule

multiply

nucleus

organic

pandemic

particle

plague

plasma

pustule

research

science

sinew

splitting

surgery

vein

virus

vitality