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. 2016 Dec 1;4:e2661. doi: 10.7717/peerj.2661

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©2016 Neches et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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After 48 h, only the positive control (A) was contaminated. Printed cylinders in LB did not appear to contaminate the media (C and D). Tube (B) contains uninoculated media.