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Relative abundance % Supplementary Figure 2. Positive MALDI-FTICR MS ion spectra of remaining pGOS purified from supernatants of B. adolescentis ATCC 15703, B. breve ATCC 15700, B. infantis ATCC 15697, and B. longum DJO10A cultures growth on mMRS containing 0.5% pGOS. Signals corresponding to galactooligosaccharides were mainly observed as sodium coordinated adducts ([M+Na]+); (*) denote signals observed as potassium coordinated adducts ([M+K]+). Four acquisitions were recorded for each biological replicate.