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. 2014 May 20;3:253. doi: 10.1186/2193-1801-3-253

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© Rushdi et al.; licensee Springer. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.

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Total ion current (TIC) traces showing the major organic tracers in propolis samples collected from. (a) Enemor (Gurghe), (b) Holleta, (c) Bako, and (d) Gedo localities in Ethiopia (1 = β-amyrone, 2 = α-amyrone, 3 = β-amyrin, 4 = α-amyrin, 5 = β-amyryl acetate, 6 = α-amyryl acetate, 7 = lup-20(29)-en-3-one, 8 = lupeol, 9 = β-lupeyl acetate, 10 = α-lupeyl acetate, 22/16, 24/16, 26/16 and 28/16 are docosyl hexadecanoate, tetracosyl hexadecanoate, hexacosyl hexadecanoate and octacosyl hexadecanoate, respectively; numbers above the symbols indicate the carbon number).