Table 3. Results for the three possible topologies for intron-position conservation among 684 KOGs.

The first column gives the ratios to be compared. The second through fourth columns give the predicted relationship between the two ratios under each of the three possible phylogenies. A circle around a prediction indicates the only prediction compatible with the data for that comparison. The Results column gives the values of the two ratios for numbers of introns in the 684 KOGs studied and the ratio of ratios. The P column gives the probability that the two ratios are equal as evaluated by Fisher's exact test.