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. 2021 Oct 1;12:748249. doi: 10.3389/fphys.2021.748249

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Copyright © 2021 Couchet, Breuillard, Corne, Rendu, Morio, Schlattner and Moinard.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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OTC, OAT, and arginase enzymes activity during development. Relative activities as percentage of activity in adult stage are shown for (A) small intestine and (B) the liver (Taken from Herzfeld and Knox, 1968).