Southern Blotting Radioactively labeled probes Developed film A Sealable plastic bag The filter is exposed to a radioactively labeled probo The filter is then exposed to X-ray film.The for a specific gene.The probe will base-pair(hybriddte) fragment containing the gene of interest is with a short sequence present on the gene. identified by a band on the developed film. Figure 9.15.3 Southern Blotting Figure 9.15.3