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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
PCA plot (A) and PLS-DA plot (B) showing spatial division among all four groups. (YC) young control group, (YP) young probiotic group, (AC) aging control group, (AP) aging probiotic group.