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. 2020 Jul 22;6(30):eabb5614. doi: 10.1126/sciadv.abb5614

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Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 1 — (A) Chromatograms of purified muropeptides from Ab17978 during stationary (stat.) and exponential (exp.) phase. Main muropeptides (no. 1-11B) are numbered according to Boll et al., 2016 (43). d-Lys–containing muropeptides (a to e) were identified by MS. Proposed muropeptide structures are shown in fig. S2. mA.U, milli absorbance units.(B) Proposed structures of d-Lys–modified muropeptides a to e. GM, N-acetylglucosamine-N-acetylmuramitol; l-Ala, l-alanine; d-iGlu, d-isoglutamate; m-Dap, meso-diaminopimelic acid; Lys, lysine; d-Ala, d-alanine. “Tri” or “Tetra” indicates the number of amino acids in the peptides chain preceding Lys.