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. 2021 Sep 15;598(7882):629–633. doi: 10.1038/s41586-021-03798-4

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© The Author(s) 2021

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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Extended Data Fig. 1 — a, BLG peptide specific to Ovis or Bovinae for DA420. b, BLG I peptide specific to Equus for DA420. c, Equus BLG I peptide for Z438. d, MS2 spectra for a Capra-specific BLG peptide for Z438. e, α-S1 casein from DA430 specific to Bovinae. f, Second α-S1 casein peptide specific to Bovidae, also from DA430. Horse, goat and cow images are reproduced from ref. ³⁷; sheep silhouette, public domain (https://thenounproject.com/icon/12538/).