2.5. Illumina MiSeq sequencing
Deep sequencing was performed on Illumina sequencing with
MiSeq using paired-end technology provided by Shanghai MajorbioCo. Ltd, China. Prior to sequencing, PCR Amplicons were extracted
from 2% agarose gels and purified using the AxyPrep DNA Gel
Extraction Kit (Axygen Biosciences, Union City, CA, U.S.) according
to the manufacturer's instructions and quality controlled on a
QuantiFluor™-ST blue fluorescence quantitative system (Promega,
USA). Following quantitation, purified amplicons from each reaction
mixture were pooled in equimolar and paired-end sequenced
(2 250) on an Illumina MiSeq platform according to the standard
protocols. The raw reads were deposited into the NCBI Sequence
Read Archive (SRA) database