20 bp DNA Ladder Marker is a DNA solution that contains 1× Loading Buffer. It can be directly used for electrophoresis after taking 5μl. 20 bp DNA Ladder Marker consists of DNA fragments with lengths of 20 bp, 40 bp, 60 bp, 80 bp, 100 bp, 120 bp, 140 bp, 160 bp, 180 bp, 200 bp, 300 bp, 400 bp, and 500 bp. It has 13 bands, among which 100 bp, 200 bp, and 500 bp are marker bands that show bright bands. This marker is mainly used for electrophoresis of small DNA fragments such as RNA interference, and it is recommended to use post-staining during electrophoresis.