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. 2017 Mar 9;7:70. doi: 10.3389/fcimb.2017.00070

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Copyright © 2017 Afzal, Kuipers and Shafeeq.

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) or licensor 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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Identification of the NiaR operator site. (A) Weight matrix of the identified NiaR operator site in the promoter regions of niaX, nadC, and pnuC. (B) Position of the NiaR operator site in the promoter region of niaX, nadC, and pnuC in different streptococci. Putative NiaR operator sites are bold and underlined. SP, S. pneumoniae; SI, Streptococcus mitis; SA, Streptococcus agalactiae; SD, Streptococcus dysgalactiae; SE, Streptococcus equi; SG, Streptococcus gallolyticus; SN, Streptococcus gordonii; SM, Streptococcus mutans; SO, Streptococcus pyogenes; SS, Streptococcus sanguinis; SU, Streptococcus suis; ST, Streptococcus thermophiles; and SB, Streptococcus uberis.