neurodegenerative – adj. relating to or marked by degeneration of nervous tissue

degeneration – n. deterioration of a tissue or an organ in which its function is diminished or its structure is impaired

extract ­– n. a substance that you get from something by using a machine or chemicals

deposit – n. an amount of something (such as sand, snow, or mud) that has formed or been left on a surface or area over a period of time

Brewer’s yeast – n. a yeast used or suitable for use in brewing; also : the dried ground-up cells of such a yeast used as a source of the vitamin B complex

plaque – n. medical : a change in brain tissue that occurs in Alzheimer's disease : medical : a harmful material that can form in arteries and be a cause of heart disease

exposure – n. the fact or condition of being affected by something or experiencing something : the condition of being exposed to something

extract ­– v. to get (a substance) from something by the use of a machine or chemicals
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