case_images: PMC8749148_01
case_images: PMC8749148_02
case_images: PMC8749148_03
case_images: MALDI mass spectrum of mcr-1-positive 
  
  E. coli
  
   directly from urine. The m/z of 1797 is the known marker for 
  
  E. coli
  
  , while the m/z of 1920 ( m/z 123) represents the addition of a phosphoethanalomine (PEtN), signifying the presence of an mcr gene.
case_images: acmi-3-0309-g001.jpg
case_images: PMC8749148_03_acmi-3-0309-g001.jpg
case_images: F1
case_images: Spectra of lipid analysis by MS showed ion species at m/z 1797 and m/z 1920, which is consistent with   E. coli   and addition of a PEtN (Fig. 1).