> For the complete documentation index, see [llms.txt](https://docs.genomenexus.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.genomenexus.org/annotation-sources.md).

# Annotation Sources 🗄️

Genome Nexus aggregates variant annotation from various sources. There are two types:

1. Small sized annotations are stored as static data in the mongo database directly. See the [genome-nexus-importer repo](https://github.com/genome-nexus/genome-nexus-importer) if you want to update/change this data.
2. For larger annotation services/databases we either run the full annotation service ourselves or the program pulls on the fly from other APIs and caches the result in the mongo database.

For a list of all supported variant annotation sources see this Google Sheet:

<https://docs.google.com/spreadsheets/d/1xML949NWzJGcvltjlquwSRIv79o13C\\_sfrVPAU5ci9Q/edit#gid=258442188>

## Versions

The mirrored annotation sources are either stored directly in the mongo database or we run the annotation service ourselves. In both cases the version is guaranteed. For the external annotion sources an API is called and responses are cached on a per request basis. Given that the external API is outside of our control, no particular version is guaranteed, but we provide links to documentation of those APIs to find the currently live version.

See all versions from `version` [API](https://www.genomenexus.org/version).


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