Erratum to: ‘The orientation of transcription factor binding site motifs in gene promoter regions: does it matter?’
BMC Genomicsvolume 17, Article number: 310 (2016)
The original article was published in BMC Genomics 2016 17:185
Unfortunately, the original version of this article  contained an error. Equation number two was missing a “–“ (a minus) sign before the sum symbol. The correct equation has been included here. This correction concerns the notation only. All computations using this equation were done correctly.
Lis M, Walther D. The orientation of transcription factor binding site motifs in gene promoter regions: does it matter? BMC Genomics. 2016;17:185.
The online version of the original article can be found under doi:10.1186/s12864-016-2549-x.