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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.”
The American journal of physiology • 1996 | View Paper
“Proline did not show any apparent effect but isoleucine, valine and serine inhibited the activity when added into the assay mixture along with ornithine.”