Assertion: prion | /r/UsedFor | refer to lacking nucleic acid
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Source sentences:
text: Virus refers to an infective agent that typically consists of a nucleic acid molecule in a protein coat and is able to multiply only within the living cells of a host while prion refers to an infectious protein particle similar to a virus but lacking nucleic acid; thought to be the agent responsible for scrapie and other degenerative diseases of the nervous system.