| Species | RefIntense Num | Refseq Num | Source |
|---|---|---|---|
| Acaryochloris marina | 1 | 2 | HMP |
| Acetivibrio ethanolgignens | 1 | 2 | MGYG |
| Acetobacter pasteurianus | 1 | 28 | HMP |
| Acetomicrobium hydrogeniformans | 2 | 2 | HMP/MGYG |
| Acholeplasma laidlawii | 1 | 16 | HMP |
| Achromobacter xylosoxidans | 1 | 142 | MGYG |
| Acidaminococcus fermentans | 2 | 6 | HMP/MGYG |
| Acidaminococcus intestini | 2 | 9 | HMP/MGYG |
| Acidaminococcus massiliensis | 1 | 2 | MGYG |
| Acidithiobacillus ferrooxidans | 1 | 23 | HMP |