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

Main topics:

- ARB: a Short Introduction
- Glossary
- SAI Sequence Associated Information

Related topics:

- Selected Species and Cursor Position

# Select Filter

- OCCURRENCE
- DESCRIPTION
- NOTES
- EXAMPLES
- WARNINGS
- BUGS

## OCCURRENCE

### ARB_NT/Tree/Neighbour joining/Select Filter

## DESCRIPTION

### Any sequence of symbols stored as 'sequence associated information' ('SAI') can be selected from the 'Select a Filter' subwindow and used as a filter for the in or exclusion of alignment columns for treeing. If any species is selected, you may use it's sequence for filter. It's name will be displayed just before the SAI names.

### The characters of the filter which define columns to exclude have to be defined in the respective input field.

### Additionally or alternatively you may define the absolute column range to be used (a range from 0 to 0 means 'use whole sequence').

### The selected filter is displayed in the subwindow on the bottom.

### All bases may be simplified, leaving only transversions and simplified amino-acid-groups, allowing transversion parsimony/fdnaml/distmethods

## NOTES

### Any nucleotide sequence can be copied to SAI (sequence associated information) (ARB_NT/Species/Info/SPECIES/Convert to SAI) and then used as a filter.

### Multiple filters may be combined. In this case only those columns are used that are selected by ALL filters.

## EXAMPLES

### Include only positions which are occupied by a residue within the E. coli sequence:

1. Select 'ECOLI' from the 'Select a Filter' subwindow.
2. Type non-nucleotide symbols to the 'Exclude Column' subwindow (.-).

### Include only non-base paired positions:

1. Select 'HELIX' from the 'Select a Filter' subwindow.
2. Type base pair symbols to the 'Exclude Column' subwindow ([<>]).

### Include only positions which have been unambiguously determined within a particular sequence:

1. Select the species and convert it to 'SAI' (ARB_NT/Species/Info/SPECIES/Convert to SAI)
2. Select the new 'SAI' from the 'Select a Filter' subwindow.
3. Type non-nucleotide and ambiguity symbols to the 'Exclude Column' subwindow (.-acguRYS ....).

## WARNINGS

### None

## BUGS

### No bugs known