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Representative putative peptide images showing distinct distribution patterns in the Medicago seedlings and the mature roots and root nodules. (a) m/z 1521.723 shows a similar distribution pattern in both the seedlings and the mature plants. (b) m/z 1000.568 and (c) m/z 1363.705 represent two of the detected peptides that show a shift in their localization from the root to the root nodules as they develop into older plants.
