Gel electrophoresis is a method by which DNA, RNA, or proteins are separated by electric current in an agarose gel or polyacrylamide gel. Gels are cast and placed in a gel box with buffer. The sample is pipetted into wells cast into the gels and the electric current is applied to the system. The electric current causes the molecules to move through the gel at different rates depending on their mass and mass to charge ratio. Once complete, staining of the molecules within the gel allows for visibility by the researcher. If the molecules are able to fluoresce, an image of the gel and molecular movement can be taken. The findings from the electrophoresis can then be transferred onto a paper by blotting (Western blotting, Northern blotting, or Southern blotting).