Amplicons were diluted 4 times and prepared as the template for PCR sequencing. The PCR sequencing protocol used M13
primers with cycling condition as below: an initial step of 2 min at 96 C and 35 cycles of 30 s at 96 C, 15 s at 55 C, and 4 min
at 60 C. Sequencing reactions were performed in an ABI 3730 capillary sequencer with BigDye Terminator Kit Version 3.1
(Applied Biosystems).