alpha-amanitin

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α-am·a·ni·tin

(am-ă-nī'tin),
A highly toxic, heat-stable bicyclic oligopeptide in the mushroom Amanita phalloides. It inhibits transcription by certain RNA polymerases.
References in periodicals archive ?
The contract has been signed in an effort to develop a novel class of antibody drug conjugates that will be based on Heidelberg Pharma's patented technology to integrate a-Amanitin to antibodies.
The death cap mushroom, which resembles the common white button mushroom, contains one of the most deadly poisons found in nature, a-amanitin.