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MALDI-TOF MS spectra of M2pep analogs: (A) W10P, (B) W10Y, and (C) K9R at different serum incubation times. Adjacent to the primary peaks are their respective Na+ adducts. (D) Binding of the M2pep analogs to M1 and M2 macrophages. Unless labeled in pairs, stars denote statistical significance between M1 and M2 macrophages in the same treatment group. * P < 0.05.
