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. 2022 Aug 23;28(1):127–140. doi: 10.1038/s41380-022-01719-z

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — This figure shows different steps that can be used to measure human oxytocin concentrations. CSF cerebrospinal fluid, RIA radioimmunoassay, EIA enzyme immunoassay, LC-MS liquid chromatography-mass spectrometry. Solid lines represent pathways that have been established. Dotted lines represent a possible pathway that requires validation.