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“Intakes of TN were positively correlated with plasma concentrations of VAL, LEU, ILE, tyrosine (TYR), histidine (HIS), and SUN (r=0.38-0.64, p<0.05-0.001), and negatively correlated with plasma arginine concentrations (r=-0.41, p<0.05).”
“Extended X-ray absorption fine structure and XPS spectra show that new copper interactions with groups containing nitrogen in the presence of histidine may occur.”
“They found that glycine, alanine, and histidine caused marked increases in amino nitrogen , whereas leucine, tryptophan, glutamic acid, aspartic acid, and cystine caused very slight if any increases.”
The Journal of biological chemistry • 1947 | View Paper
“The inhibitory effect of histidine was ascribed to the imidazole group and may arise from the formation of a different iron complex or the acceleration of polymerization, dehydration, and insolubilization of the ferric ion by the imidazole nitrogen.”