N. meningitidis strain 8013 has putative type I secretion units for the export of polypeptides that may play a role in colonization or virulence by acting, respectively, as bacteriocins or pheromones. (a) Alignment of the double-glycine motifs in the putative bacteriocin/pheromones found in strain 8013. Amino acids are shaded in purple (identical) or in light blue (conserved) when present in at least 80% of the aligned sequences. (b) General features of the putative bacteriocin/pheromones. aa, amino acids.