1 – 10 kb DNA Ladder
The higher bands are brighter than those at the lower end, with the transition to higher intensity at the 2 kb band serving as a useful reference point. Each fragment contains a 5' overhang (TTAA) that can be radioactively labeled using the Klenow Fill-In Kit. DNA fragments may also be detected via nonradioactive Southern blot analysis by incorporating fluor-modified nucleotides into the DNA prior to electrophoresis and using a tan Illuminator Chemiluminescent Detection System.