Editing a dataset using Keep. The phylogenetic tree contains all sequences in the DemoTreePruner dataset (obtained using instructions in Figure 1). Black labels and lines indicate seven taxa that have been tagged for retention in the dataset (black labels are indicated by black arrows). The remaining sequences are currently active, indicated by the blue labels and lines: these can be selected by future Keep actions. At the end of a Keep session, the user can Save these actions and switch to a Remove/Restore session; any unselected (blue) tips will be colored grey. If no further editing actions are performed, sequences corresponding to black labels in the tree will comprise the edited dataset. Other features: the green circle indicates the most recently touched node; custom Tree Pruner data management functions are indicated; the custom Keep action is selected in the pull-down menu indicated; the tab at the top of the tree gives the name of the working set that is being edited.