Figure 4. Density of significantly changing positions in determined clusters vs. length. (A) Clusters that occur only in wt mRNAs but are not statistically significant (37). (B) Clusters occurring in both wt and ca/ts mRNAs (126). (C) Clusters that occur only in ca/ts mutants but are not statistically significant (45). (D) Statistically significant clusters (9 of them occur only in ca/ts mutants and 1 of them occurs only in wt mRNA). Different colors show different numbers of clusters that have identical values of length and density. Black, one cluster; red, two clusters; green, three clusters; blue, four clusters.