Plant AlkaloidsChemical substance of plant origin composed carbon, hyrdrogen, nitrogen and usually oxygen. Many have toxic or medicinal properties (Cocaine and heroin as painkillers and anaesthetics)Aconitine (from monkshood) Sometimes known as queen of poisons, derived from aconite species. It is a neurotoxin that opens TTX-sensitive Na+ channels in the heart and other tissues, and is used for creating models of cardiac arrhythmia.

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