Photo shows an agarose gel illuminated under UV light. The gel is nine lanes across. Each lane was loaded with a sample containing DNA fragments of differing size that have separated as they travel through the gel, from top to bottom. The DNA appears as thin, white bands on a black background. Lanes one and nine contain many bands from a DNA standard. These bands are closely spaced toward the top, and spaced farther apart further down the gel. Lanes two through eight contain one or two bands each. Some of these bands are identical in size and run the same distance into the gel. Others run a slightly different distance, indicating a small difference in size.