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. 2019 Jan 19;9:9. doi: 10.1186/s13568-019-0735-3

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© The Author(s) 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — Comparative analysis of β-galactosidases in infant-derived bifidobacterial (sub)species. Heatmap showing presence (red) and absence (blue) of 18 clusters of β-galactosidase-encoding genes across the 34 bifidobacterial representatives of B. breve, B. bifidum, B. longum subsp. longum and B. longum subsp. infantis. A blue arrow highlights Cluster 15, which is present across members of all the four (sub)species, while blue, green and brown colours identify clusters observed only in B. bifidum, B. breve and B. longum species, respectively