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[Preprint]. 2024 Jun 11:rs.3.rs-4448907. [Version 1] doi: 10.21203/rs.3.rs-4448907/v1

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Figure 2: — Representative MALDI-TOF MS spectra for WT and vaccine strains of (A) S. sonnei and (B) S. flexneri 2a chromosomally expressing lpxE or Dual. Spectral peaks represent [M-H]⁻ ions. Colored peaks correspond to the expected structures detailed in Figure 1. Arrows depict the loss of a phosphate (HPO₃) or acyl chain (3OH C14) from the indicated lipid A species.