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“The metabolism of arginine to CO 2 , ornithine, and proline and of ornithine to CO 2 and proline decreased by >85% in the presence of valine and gabaculine, respectively.”
Comparative biochemistry and physiology. B, Comparative biochemistry • 1992 | View Paper
“Glycine, lysine, arginine, valine , isoleucine, and tryptophan in the second position are (with N-terminal serine) strongly inhibitory, and proline completely blocks modification.”