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persistent - adj. existing for a long time
characteristic - adj. typical of a person, thing, or group : showing the special qualities or traits of a person, thing, or group
inflammation - n. a condition in which a part of your body becomes red, swollen, and painful
scar - n. a mark left on the skin after a wound heals
symptom - n. a change in the body or mind which indicates that a disease is present
unique - adj. belonging to or connected with only one particular thing, place, or person
blood clot - n. a thick and sticky clump of dried blood that stops blood from flowing through a blood vessel in a person or an animal
nuclei - n. biology : the central part of most cells that contains genetic material and is enclosed in a membrane
