SRX24123081 ID_1_3F_V2 mouse fecal microbiota 16S rRNA gene sequencing SRP486246 PRJNA1069621 The 16S library preparation and sequencing adhered to the Illumina protocol. SRS20908609 SAMN40716490 ID_1_3F_V2 AMPLICON METAGENOMIC PCR Illumina MiSeq