The DL5000 DNA Marker consists of 9 bands, which are composed of 100, 250,500, 750, 1,000, 1,500, 2,000, 3,000 and 5,000 bp respectively. Agarose gel electrophoresis suitable for PCR products or DNA fragments ranging from 100 bp to 5,000 bp. Among them, 500 bp is the indicator band, showing a bright band with a band concentration of approximately 100 ng / 5 μL, and the concentrations of the remaining bands are all approximately 50 ng / 5 μL.