# 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: ## 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). --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.genomenexus.org/annotation-sources.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.