24s rDNA of mice
Fecal genomic DNA was extracted using a DNA extraction kit (Tiangen Biotech, Shanghai, China). The primer pair 27F-1492R (forward: 5'-AGTTTGATCMTGGCTCAG-3'; reverse: 5'-GGTTACCTTGTTACGACTT-3') was used for full-length 16S rDNA high-throughput sequencing.