Figure 2.

Hypothetical examples of phylogenetic trees showing the patterns of retention of duplicates. (a) Six phyletic patterns showing the (RO)(RO) pattern (both of the duplicates were retained in plants and animals/fungi). (b) Three phyletic patterns showing the (RO)(R) pattern (one of the duplicates was lost in animals/fungi). (c) Seven phyletic patterns showing the (RO)(O) pattern (one of the duplicates was lost in plants). (d) Six phyletic patterns that supported an early eukaryotic duplication in eukaryote-specific gene clusters.