> For the complete documentation index, see [llms.txt](https://doc.duaer.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://doc.duaer.com/getting-started/ensembl-homology.md).

# Search Ensembl homology in Duaer

In Duaer, list Ensembl compara orthologues for a gene symbol. One successful search uses 1 credit.
## What you get

Ensembl homology in the Duaer data market uses 1 credit per successful search.

Related: [orthologs](/getting-started/orthologs.md).

## Search on the canvas

1. Open the node creator, pick Duaer Data → Ensembl homology .
2. Fill Words (default BRCA1) or ID.
3. Limit defaults to 10, max 20. Execute.

A successful search uses 1 credit.

## Call the API

- GET https://api.duaer.com/v1/data/ensembl-homology?...
- Authorization: Bearer <Duaer key>

The call skill below matches Copy skill.

## Call skill

Same text as Copy skill.

```
---
name: duaer-ensembl-homology
description: >-
  List Ensembl compara orthologues for a gene symbol through Duaer.
  One successful search uses 1 Duaer credit.
---

# Duaer Ensembl homology

List Ensembl compara orthologues for a gene symbol through Duaer with a Duaer key.

## Call

`GET https://api.duaer.com/v1/data/ensembl-homology?words=BRCA1&limit=10`

Provide `words` or `id`.
- `words` — gene symbol, such as BRCA1.
- `id` — optional. Gene symbol such as BRCA1.
- `limit` — optional. From 1 to 20. Default 10.

## Result

Each item has `source`, `title`, `url`, `summary`, `geneId`, `species`, `type`, and `proteinId`.

```
## Questions

### How many credits does a Ensembl homology search use in Duaer?

One successful search uses 1 credit.