arecoline An alkaloid isolated from Areca catechu (betel palm) and one of the major pharmacologically active components; a muscarinic acetylcholine receptor agonist. Effects on the central nervous system are similar to those of nicotine. Has also been used medicinally as an anthelminthic.
Arenaviridae Family of ssRNA viruses including Lassa virus, lymphocytic choriomeningitis virus and the Tacaribe group of viruses; not all require arthropods for transmission, despite their inclusion in the arbovirus group.
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