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. 2020 Apr 20;375(1800):20190269. doi: 10.1098/rstb.2019.0269

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© 2020 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 3. — The structure of the three classes of odourant precursors: the volatile odourants are linked similarly to typical phase II metabolites produced in the liver: glutamine, Cys–Gly and glucuronide conjugates. (Online version in colour.)