Southern Blotting Paper towels Nitrocellulose filter Salt solution Sponge Gel Gel DNA Nitrocellulose transferred filter to filter The DNA bands are transferred to a nitrocellulose This produces a nitrocellulose filter with DNA filter by blotting.The solution passes through the fragments positioned exactly as on the gel. gel and filter to the paper towels. Figure 9.15.2Southern Blotting Figure 9.15.2