Editing Agarose gel electrophoresis (section)

===Loading of samples===
Once the gel has set, the comb is removed, leaving wells where DNA samples can be loaded. Loading buffer is mixed with the DNA sample before the mixture is loaded into the wells. The loading buffer contains a dense compound, which may be glycerol, sucrose, or [[Ficoll]], that raises the density of the sample so that the DNA sample may sink to the bottom of the well.<ref name=":0" /> If the DNA sample contains residual ethanol after its preparation, it may float out of the well. The loading buffer also includes colored dyes such as [[xylene cyanol]] and [[bromophenol blue]] used to monitor the progress of the electrophoresis. The DNA samples are loaded using a [[pipette]].