> 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/expression-atlas.md).

# Search Expression Atlas in Duaer

In Duaer, search bulk expression experiments in Expression Atlas. One successful search uses 1 credit.
## What you get

Expression Atlas in the Duaer data market uses 1 credit per successful search.

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

## Search on the canvas

1. Open the node creator, select Duaer Data, then Expression Atlas.
2. Enter Words (default human liver) or an id.
3. Limit defaults to 10, max 20.

A successful search uses 1 credit.

## Call the API

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

Below is the same English call skill as Copy skill.

## Call skill

Same text as Copy skill.

```
---
name: duaer-expression-atlas
description: >-
  Search bulk expression experiments in Expression Atlas through Duaer.
  One successful search uses 1 Duaer credit.
---

# Duaer Expression Atlas

Search bulk expression experiments in Expression Atlas through Duaer with a Duaer key.

## Call

`GET https://api.duaer.com/v1/data/expression-atlas?words=human%20liver&limit=10`

Header: `Authorization: Bearer <Duaer key>`

Use an account key or a model API key.

Provide `words` or `id`.
- `words` — experiment words, such as human liver.
- `id` — optional. Accession such as E-MTAB-5214.
- `limit` — optional. From 1 to 20. Default 10.

## Result

Each item has `source`, `title`, `url`, `summary`, `accession`, `species`, `experimentType`, and `assayCount`.

```
## Questions

### How many credits does a Expression Atlas search use in Duaer?

One successful search uses 1 credit.