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Comparisons have been made of the effectiveness of acetyl-D-, acetyl+, and acetyl-DL-tryptophan in the maintenance of nitrogen equilibrium in human subjects deprived of L-tryptophan. The results demonstrate that by guest on March 23, 2020 http://www.jbc.org/ Downloaded frompmid:13233223 fatcat:udd7k67xdfblteswmzf3suc474