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Bufotoxins are a family of toxic steroid lactones . They occur in the parotoid glands , skin and poison of many toads ( genus Bufo ) and other amphibians, and in some plants and mushrooms.    The exact composition varies greatly with the specific source of the toxin. It can contain: 5-MeO-DMT , bufagins , bufalin , bufotalin , bufotenin , bufothionine , epinephrine , norepinephrine , and serotonin . The term bufotoxin can also be used specifically to describe the conjugate of a bufagin with suberylargine.