Zein
Usage examples:
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1886. 10. Alaeddin and Zein ul Asnam.
Thomas Wright in "The Life of Sir Richard Burton". -
Animals fed on the zein mixture died in a few days but the inexplicable thing was that when the missing tryptophan was added to the diet the animals lived a little longer but finally declined and died.
Walter H. Eddy in "The Vitamine Manual".