> 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/domains.md).

# Search domains in Duaer

In Duaer, search InterPro domains with Duaer Data. One successful search uses 1 credit. Use domainId with proteins.domain. This page includes the full English call skill.
## What you get

Domains in the Duaer data market searches InterPro. One successful search uses 1 credit.

Add the node from the [Duaer Data category](/getting-started/duaer-data.md) (Domains), or copy the skill on the [data market](/getting-started/data-market.md). Use domainId with [Proteins](/getting-started/proteins.md) Domain.

## Search on the canvas

1. Open the node creator, select Duaer Data, then Domains.
2. Words alone is enough (a new node starts with kinase). Domain ID and Name are optional.
3. Limit defaults to 10, max 20. Select Execute step.

A successful search uses 1 credit. Use domainId as domain when searching proteins. Production deliverables land in the [data pool](/getting-started/data-pool.md).

## Call the API

- GET https://api.duaer.com/v1/data/domains?...
- Authorization: Bearer <Duaer key>
- Fields combine; at least one search field is required.

For keys, refer to [Authentication for the Duaer public API](/api/authentication.md). Below is the same English call skill as Copy skill.

## Call skill

Same text as Copy skill on the Duaer data market. Keep it English.

```
---
name: duaer-domains
description: >-
  Search InterPro domains through Duaer. Use the domainId with proteins.domain.
  One successful search uses 1 Duaer credit.
---

# Duaer domains

Search InterPro domains through Duaer with a Duaer key.

## Call

`GET https://api.duaer.com/v1/data/domains?q=kinase&limit=10`

Header: `Authorization: Bearer <Duaer key>`

Use an account key or a model API key.

At least one search field is required. Fields combine.
Search with `q` first; use `id` only when you already have an InterPro id from a result.

- `q` — words in the domain name or description.
- `id` — optional. InterPro id from a result (`domainId`), such as `IPR000719`.
- `name` — optional. Domain name.
- `limit` — optional. From 1 to 20. Default 10.

## Result

Each item has `source`, `title`, `url`, `summary`, `domainId`, `type`, `shortName`, `goIds`, and `memberDatabases`.
Use `domainId` as `domain` when searching proteins. Reuse `domainId` in `id` for an exact lookup.

## Credits

One successful search uses 1 credit.
An empty search, a failed search, a compound that matches nothing, or no remaining credits uses 0.
No remaining credits returns 402 and does not search.
A missing key returns 401.

```
## Questions

### Where do I use a domain from Duaer?

Put the item domainId into the Proteins Domain field in Duaer.

## Related

- [Search proteins in Duaer](https://doc.duaer.com/getting-started/proteins.md)
- [Search Gene Ontology in Duaer](https://doc.duaer.com/getting-started/gene-ontology.md)
- [Search pathways in Duaer](https://doc.duaer.com/getting-started/pathways.md)
- [Search genes in Duaer](https://doc.duaer.com/getting-started/genes.md)