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. 2017 Feb 23;17:124. doi: 10.1186/s12906-017-1636-0

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© The Author(s). 2017

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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 4 — MTT assay showing the growth inhibitory effects of alkaloid extracts from C. zeyheri on M. smegmatis. Viable cells are coloured purple whilst metabolically inactive cells are coloured yellow. The intensity of the purple also shows levels of cell activity