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. 2018 Apr 6;28(2):61–67. doi: 10.1007/s00049-018-0257-5

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 2 — Gas chromatographic profiles of the scent gland secretion of Nemastoma triste. a “Full profile” of an individual with well-filled glands; b “reduced profile” of an individual with partly emptied glands (see text for details). Peak A (heptan-2-one), B (5-methyl-heptan-2-one), C (nonan-2-one), D (6-methyl-nonan-2-one), E (1,4-naphthoquinone), F (6-tridecen-2-one), G (8-tridecen-2-one), H (6-methyl-1,4-naphthoquinone), I (4-chloro-1,2-naphthoquinone), J (4-chloro-6-methyl-1,2-naphthoquinone)