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Flow cytometry analysis of E. faecium (drug resistant) treated overnight with 100 μM of tetrapeptide (A) or pentapeptide (B) with variations. Data are represented as mean + SD (n = 3). Chemical series of tetrapeptides and pentapeptides with variations at the C-terminus (acid/amide), terminal residue(s) (D-Ala/L-Ala), second position (iso-Gln/iso-Glu), and third position (L-Lys/acetylated L-Lys).
