?:definition
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Catalysis of the reaction: an N-acetylneuraminate glycoside = 2,7-anhydro-alpha-N-acetylneuraminate + an alpha-sialyl group. This reaction is the elimination of alpha-sialyl groups in N-acetylneuraminic acid glycosides, releasing 2,7-anhydro-alpha-N-acetylneuraminate. [EC:4.2.2.15]
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