| More docs on the ARB website. See also index of helppages. Last update on 10. Sep 2018 .

Main topics:

- ARB: a Short Introduction
- Glossary

Related topics:

- ARB_EDIT4 - Sequence primary and secondary structure editor
- What are Marked Species?

# Selections of Species (Configurations)

- OCCURRENCE
- DESCRIPTION
- NOTES

## OCCURRENCE

### ARB_NTREE/Species/Selections

## DESCRIPTION

### Each species is either marked or unmarked. All species that are marked are called marked species. In order to handle multiple sets of marked species we use configurations ( = selections of species).

### Several operations are possible with the configurations:

- STORE (save a (new) configuration)
- EXTRACT (= unmark all, then mark those from configuration)
- MARK/UNMARK/INVERT (mix currently marked species with those marked in configuration)
- COMBINE (unmarks all that are not in configuration. This does an intersection between the currently marked species and the selected configuration)
- DELETE (delete a configuration)
- RENAME (rename a configuration)

### Each configuration has a unique name and is part of the database. The current tree displayed within the ARB_NT main window is stored with the configuration.

### ARB_EDIT4 may load all marked species or all species stored in a configuration.

## NOTES

### Saving the database means also saving all configurations.