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A South American vine.
It is a member of the Menispermaceae and is the source of D-tubocurarine. Tubocurarine is a potent isoquinoline alkaloid used in the deadly poison curare. The alkaloid D-tubocurarine blocks acetylcholine receptor sites at neuromuscular junctions, causing relaxation and paralysis of muscles, including respiratory organs and the heart. Muscles which are more highly innervated, such as the eye muscles, are affected first by D-tubocurarine.

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