Palytoxin is an intense vasoconstrictor, and is considered to be one of the most toxic non-peptide substances known, second only to maitotoxin in terms of toxicity in mice. Palytoxin is a natural compound that is produced by several marine species and can be found in many more species due to accumulation. Palytoxin was originally isolated in 1971 ...
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http://en.wikipedia.org/wiki/Palytoxin
Linear peptide (2670 D) from corals of Palythoa spp. that binds to Na+/K+ ATPase at a site overlapping that of ouabain and converts it into a channel. Extremely toxic and said to be the most potent animal-derived toxin.
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http://www.encyclo.co.uk/visitor-contributions.php
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