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. 2021 Jun 23;11:20. doi: 10.1038/s41387-021-00164-1

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© The Author(s) 2021, corrected publication 2021

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Fig. 1 — Arg breakdown is performed by iNOS and Arg1. iNOS catalyses the conversion of Arg into NO and citrulline, while Arg1 catalyses the conversion of Arg into ornithine and urea.