4.2.2. Bacterial Genomic DNA Isolation
Bacterial genomic DNA (gDNA) from 132 facial skin microbial swab samples were extracted using the QIAamp PowerFecal Pro DNA Kit (Qiagen, Hilden, Germany), and all experimental processes were performed following the optimal protocols provided by the DNA extraction kit. The quality check of all extracted bacterial gDNA was conducted using the NanoDrop One (ThermoFisher Scientific, Waltham, MA, USA) equipment. All extracted gDNA samples were stored at 4 °C until the following process.