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. 2017 Jun 6;17:96. doi: 10.1186/s12903-017-0382-5

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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. 2 — Bactericidal effect of 310 nm UVB-LED irradiation on oral bacteria. Each bacterial suspension (0.1 ml) in 96-well plates was irradiated by a UV-LED. The suspensions were serially diluted and incubated on agar plates at 37 °C anaerobically. Colonies on the plates were counted after incubation for 1–7 days. Bactericidal levels are indicated as viability (%). (n = 3 or 5, means ± SE; **P < 0.01 vs. 0 s, *P < 0.05 vs. 0 s)