| More docs on the ARB website. See also index of helppages. Last update on 27. Jun 2017 .

Main topics:

- ARB: a Short Introduction
- Glossary
- What are Species ?

Related topics:

- E. coli Reference
- Helix

# SAI Sequence Associated Information

- DESCRIPTION
- IMPLEMENTED SAI's
- NOTES

## DESCRIPTION

### The main database divides all sequences into two groups:

1. Species sequences -> Species
2. All other sequences -> SAI ( masks, filters, profiles )

### You should keep the number of SAI's small for you cannot:

- search SAI's
- select a subset of SAI's

## IMPLEMENTED SAI's

### ECOLI

A copy of the E.coli sequence. It is used to convert the absolute alignment position into an E.coli-based position and vice versa. (Note: you may use any other sequence instead of ECOLI. The name displayed in ARB_EDIT4 can be modified under Properties/NDS)

### HELIX_NR

Helix Numbering

### HELIX

and Helix template

## NOTES

### Read ´Helix´