Current release
The entire OMA database is available for download in several formats. It is also possible to download each group separately. This option is available in the group view. Please read our terms and conditions before integrating OMA data into your own research or database.
Orthology Relationships
The orthology relationships are available in two types: groups or pairs of orthologs. The information is given in terms of OMA identifiers (of the form HUMAN04376).
| OMA groups: |
Text format
OrthoXML format |
| Hierarchical orthologous groups (HOGs): | OrthoXML format |
| Species phylogeny of HOGs |
Phyloxml format
Newick format |
| Pairwise orthologs: |
Text format
|
| Pairs between two species: |
Genome Pair View 
|
Sequences
All sequences with the corresponding OMA identifiers can be downloaded in fasta files. The proteins are all in one file, while the coding DNA is split into two files, one for the Eukaryotes and one for the Prokaryotes.
| Protein sequences: |
Fasta format
SeqXML format |
| cDNA Eukaryotes: |
Fasta format |
| cDNA Prokaryotes: |
Fasta format |
| Protein Annotations: |
Text format |
Identifier Mapping
Mappings of the OMA identifier to various other databases are available. Mappings to UniProt, RefSeq and EntrezGene IDs are based on exact sequence matches, other cross-references come from source genome files directly. :
| Mapping to UniProt: |
Text format |
| Mapping to Ensembl: |
Text format |
| Mapping to Refseq ACs: |
Text format |
| Mapping to Entrez Gene IDs: |
Text format |
| Mapping to NCBI GIs: |
Text format |
| Mapping to NCBI GenBank IDs: |
Text format |
| Mapping to Wormbase: |
Text format |
| Mapping to JGI: |
Text format |
| Mapping to GO: |
Text format |
| Plant mappings: |
Text format |
Other files
| OMA Groups/Sequences in COGs format: |
Cog format |
| Species information: (Taxon IDs, scientific names, genome sources) |
Text format |
| Group descriptions: |
Text format |
| Close OMA Groups: |
Text format |
OMA ID History
Mappings of the OMA identifier of updated genomes from one release to another. We track only proteins with same amino acid sequences.