Assertion: prion | /r/AtLocation | the food
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Source sentences:
text: Prions can be found in the food in which cows eat (specifically sheep brain), when ingested, the harmful prion eventually can cause other normal proteins to begin misfolding and aggregating and than turn into harmful prions; this can take a long period of time, which leads to the build-up of these prions which eventually can lead to neurodegeneration.