It has come to the editor’s attention that the additional files (Additional file 1: Table S1, Additional file 2: Table S2 and Additional file 3) referred to in the original article  were not included at publication. We would like to sincerely apologize for this error. The additional files (Additional file 1: Table S1, Additional file 2: Table S2 and Additional file 3) can be accessed below.
Additional file 1: Table S1. 43 putative periplasmic or membrane proteins. Proteins were annotated as periplasmic, membrane or membrane associated or were identified by signal peptide or TMH analysis (indicative of either periplasmic or membrane location). gi is the NCBI gene ID number; SigP indicates presence of a predicted signal sequence as determined by SignalP (22); TMD represents the presence of transmembrane domains as predicted by TMHMM (23); COG is the COG number for the identified protein with associated category, description and gene.
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