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Base peak chromatogram of GDGT-based IPL profiles (m/z 1,000 to 2,000) of “Ca. Nitrosoarchaeum koreensis” MY1 (a), “Ca. Nitrososphaera” strain JG1 (b), and Nitrososphaera viennensis EN76 (c). Peak numbers correspond to the IPL structures described in Table 2. Stars indicate contaminants.
