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Experimental design scheme. PN, postnatal day; Neu5Ac, N-acetylneuraminic acid; 6′-SL, 6′-sialyllactose; NORT, Novel Object Recognition Test; PSA-NCAM, polysialylated-neural cell adhesion molecule; LTP, long-term potentiation; Sia, sialic acids; ♀, female; ♂, male.
