immune system – n. the cells and tissues in the body that fight against infection

therapy – n. the work of treating illness

landmark – adj. event seen as famous or important in the history of something

fundamentally – adv. relating to the most important or main part of something

humble – v. having or showing a modest or low estimate of one's own importance

prestigious – adj. respected and admired

opportunity – n. situation in which it is possible for a person to do something

gratifying – adj. giving pleasure or satisfaction
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