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. 2023 Jul 6;2(7):pgad221. doi: 10.1093/pnasnexus/pgad221

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© The Author(s) 2023. Published by Oxford University Press on behalf of National Academy of Sciences.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 3. — Comparative metabolic profiling of extracellular extracts from L. shetlandiensis sp. nov. WUR7 grown in culture conditions 1 A), 2 B), and 3 C). Product ion/precursor ion plots from MS/MS data of the extracellular extracts highlight precursor ions sharing the fragment ion at m/z 144.01 (red square). Tryptophan addition (condition 3C) triggers the secretion of a massive number of bacterial metabolites displaying a common structural motif, which has been later shown to be diagnostic of indole-based alkaloids.