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The proportion of different kinds of metabolites detected in serum and AF samples in CON and GDM. (a) The proportion of different kinds of metabolites only found in serum or AF samples. (b) The proportion of different kinds of common metabolites shared by serum and AF samples. CON-serum: serum samples in CON group; GDM-serum: serum samples in GDM group; CON-AF: AF samples in CON group; GDM-AF: AF samples in GDM group; AF: amniotic fluid.
