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. 2020 Mar 5;11:1207. doi: 10.1038/s41467-020-15004-6

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — a Bactericidal activity of control, [Au₂₅(Cys)₁₈] only, CV only, Cysteine only and CV&[Au₂₅(Cys)₁₈] against S. aureus in dark (n = 6 independent samples). CV indicates crystal violet. b, Bactericidal activity of control, [Au₂₅(Cys)₁₈] only, CV only, Cysteine only and CV&[Au₂₅(Cys)₁₈] against S. aureus in white light (n = 6 independent samples). c Bactericidal activity of control, [Au₂₅(Cys)₁₈] only, CV only, Cysteine only and CV&[Au₂₅(Cys)₁₈] against E. coli in the dark (n =6 independent samples). d Bactericidal activity of control, [Au₂₅(Cys)₁₈] only, CV only, Cysteine only and CV&[Au₂₅(Cys)₁₈] of E. coli in white light (n=6 independent samples). Bacteria inoculated materials were exposed to white light with an intensity from 200 to 429 lux. Data presented as mean ± SD. ^aCFU mL⁻¹ indicates Colony forming unit per mL. Blue star represents below detection limit: <10² CFU mL⁻¹.