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We investigated the roles of extracellular sialidases (SiaBb1 and SiaBb2) in cross-feeding between sialidase-carrying Bifidobacterium bifidum and sialic acid-utilizing Bifidobacterium breve. Using 6ʹ sialyllactose (6ʹSL) as a carbon source, the number of wild-type B. bifidum cells increased while that of a siabb2-inactivated strain (Δsiabb2) did not. Coculture of these two strains in the presence...