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. 2017 Mar 29;17:76. doi: 10.1186/s12866-017-0988-4

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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. 1 — Cholesterol oxidase activity of different actinomycete strains detected by plate assay method. Development of pink color in the medium surrounding the colony due to the formation of quinoneimine dye indicated the presence of cholesterol oxidase activity; Streptomyces fradiae strain NEAE-82 cannot produce cholesterol oxidase activity