![]() ![]() Other understandings embrace synthetic analogs of naturally occurring organic poisons as toxins, and may or may not embrace naturally occurring non-organic poisons. Less strict understandings embrace naturally occurring non-organic toxins, such as arsenic. Toxins are often distinguished from other chemical agents strictly based on their biological origin. They vary greatly in their toxicity, ranging from usually minor (such as a bee sting) to potentially fatal even at extremely low doses (such as botulinum toxin). Toxins can be small molecules, peptides, or proteins that are capable of causing disease on contact with or absorption by body tissues interacting with biological macromolecules such as enzymes or cellular receptors. The term was first used by organic chemist Ludwig Brieger (1849–1919) and is derived from the word " toxic". They occur especially as proteins, often conjugated. Naturally occurring organic poison The Amanita muscaria mushroom, an iconic toxic mushroom.Ī toxin is a naturally occurring organic poison produced by metabolic activities of living cells or organisms. ![]()
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