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. 2018 Oct 2;8:330. doi: 10.3389/fcimb.2018.00330

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Copyright © 2018 Abhishek, Saikia, Gupta, Bansal, Gupta, Singh, Laal and Verma.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Percent cytotoxicity caused by M. tuberculosis to ARPE-19 cells. (A) Mean ± SEM O.D. values at 570 nm (A570) of uninfected and infected ARPE-19 cells at different time-points (0-,−1-, 3-, 5-dpi). (B) Cytolysis of cells was quantified using MTT dye at different time-points. *p < 0.05 in comparison to 0- dpi. The percent (%) cytotoxicity was calculated as = (Mean O.D. of control cells - Mean O.D. of infected cells)/Mean O.D. of control cells × 100. dpi, day post infection; SEM, standard error of the mean.