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“Thus while zinc was associated positively with some amino acids (such as glutamic acid and alanine), copper correlated almost invariably in a negative manner with citrulline , alpha-amino-butyric acid, proline, glycine and valine.”
Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et metabolisme • 1990 | View Paper
“In conclusion, supplementation with 250 ppm Cu from Cu CIT or Cu SUL resulted in decreased apparent P retention.”
“… Cu … CIT reduced apparent P retention by 0.029 and 0.053 percentage-units of the diet, respectively (P < or = 0.05) as compared with the … retention when 250 ppm Cu LYS or Cu CL was fed was not different from the 0 ppm Cu diet (P > 0.05).”