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noun
BiochemistryAny of a group of steroids which act as ecdysones in various arthropods and are found primarily in certain plants, where they have a protective role against insects.
Origin
1960s. From po- (in scientific Latin Podocarpus) + na- (in scientific Latin nakaii, specific epithet) + -sterone. So called because the first ponasterones were isolated from the Japanese podocarp Podocarpus nakaii.
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