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The extrafloral nectar from involucral bracts of Helianthella quinquenervis has more nonprotein (5) and total (24) amino acids than have been reported for any other extrafloral nectar. Seven to twelve additional unknowns, probably nonprotein amino acids, were also found. The concentrations of amino acids (8–10 on the histidine scale) were the highest ever reported for extrafloral nectar. Most amino acids were found in all samples, while others were variable in their occurrence.
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