For visualization purposes, the DNA fragment is usually labeled with a radioactive, fluorescent or biotin label, as standard ethidium bromide staining lacks the sensitivity to detect the relatively small amounts of DNA used in these experiments.
The DNA fragment is usually labeled with a radioactive, fluorescent or biotin label. This was for visualization purposes. Standard ethidium bromide staining lacks the sensitivity to detect the relatively small amounts of DNA. This DNA is used in these experiments.