GelEval helps molecular biologists analyse and quantify gel images (immunoblots, protein, DNA or RNA gels). Starting from the scanned image of a gel, GelEval allows you to delimit the boundaries of individual bands and/or lanes. It can measure the densities of individual gel bands and can show the changing density along individual gel lanes. The total density of individual bands can then be measured. If your gel contains known standards, line-fitting is applied to express band intensity relative to the standards. Alternatively, lanes can be scanned to give a graphical representation of intensity as you move from top to bottom of the delimited region.