Fig. 4From: Re-classification within the serogroups O3 and O8 of Citrobacter strainsNMR spectra of the isolated OPS. Shown are the 1H NMR spectra (a, c) and 13C NMR spectra (b, d) of the OPS of Citrobacter PCM 1573 (a, b) and PCM 1504 (c, d). Expanded regions of the 1H NMR spectra are shown in the insetsBack to article page