a<p>Peak numbers refer to <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0032301#pone-0032301-g002" target="_blank">Figure 2</a> and <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0032301#pone.0032301.s004" target="_blank">Figure S3</a>. New peaks obtained after Lc-p75 digestion, are indicated by letters.</p>b<p>Di, disaccharide dipeptide (L-Ala-D-iGln); Tri, disaccharide tripeptide (L-Ala-D-iGln-L-Lys); Tetra, disaccharide tetrapeptide (L-Ala-D-iGln-L-Lys-D-Ala); Disaccharide, GlcNAc-MurNAc; Ac, acetylation on MurNAc, iGln, isoglutamine; N, D-Asn; A, D-Ala; K, L-Lys.</p>c<p>Sodiated molecular ions were the most abundant ones on MALDI-TOF mass spectra for all muropeptides.</p>d<p>Percentage of each peak was calculated as the ratio of the peak area over the sum of areas of all the peaks identified in the corresponding chromatogram (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0032301#pone.0032301.s008" target="_blank">Table S3</a>).</p>e<p>ND, non detected.</p

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