The divergence of the Daphnia's paralogs. (A) Tree Score (TS) is the number of proteins in the distance tree divided by the number of leaves in the minimum sub-tree which include all the proteins of interest. In the scheme, the minimum sub-tree that contains all of the protein of interest (marked red) is indicated with a blue triangle. If the proteins of interest diverged from each other, then the TS is small (left side of the graph). In the case for TS = 0.33, the proteins of interest are intermix with the other proteins. In the opposite case, the proteins of interest (marked red) are close to each other in the distances tree (right tree), so the sub-tree will have a maximal value of the TS (up to 1.0). (B) Histogram of the TS partitioned according to the number of paralogs. Clusters with two mapped Daphnia proteins are marked green. Clusters with 3-9 mapped Daphnia proteins are marked in red. Clusters with at ≥ 10 Daphnia mapped proteins are marked in blue. Histogram of TS of Daphnia (C) and Drosophila (D) for clusters with ≥ 10 mapped proteins. Note that Daphnia's TS values cover the entire range of TS (from 0 to 1.0) while high TS clusters are missing in Drosophila.