16s rDNA amplicon of endogenous expansion stage replicate 7
DNA for each sample was extracted with FastDNA SPIN Kit (MP Biomedicals), then V5-V8(799F-1193R) and of 16S rDNA was amplified by two-step PCR.    Finally, the amplicons were sequenced on Illumina MiSeq PE300 platform in pair-end 326 bp mode