skin

immunity

defense

immune

system

disease

treat

thymus

antibodies

active

passive

autoimmunity

macrophage

blood

cell

health

service

complement

lymphatic

hypersensitivity

immunodeficiencies

human

innate

spleen

organ

bone

marrow

white

fibroblast

digestive

tract

lungs

body

function

medical

healthcare

plasma

cellular

biology

microbiology

icon

motion

animation

hd

animated