FIG. 5.

Summary of DNA-DNA cross-hybridization experiments. Each panel shows the results obtained with a different phage. The EcoRI-cut genome of each phage was separately probed with DNA from each of the six phages, including itself. Thus, in each panel there are six columns, each showing the band pattern produced when the digest was probed with a particular labelled phage. When a phage was probed with itself, the full digest pattern, as shown in Fig. 4A, was revealed.