> 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/atlas.md).

# Search tissue atlas in Duaer

In Duaer, search Human Protein Atlas tissue-enriched expression with Duaer Data. One successful search uses 1 credit. This page includes the full English call skill.
## What you get

Tissue atlas in the Duaer data market returns HPA tissue-enriched nTPM (plus specificity and secretome location). One successful search uses 1 credit.

Add the node from the [Duaer Data category](/getting-started/duaer-data.md) (Tissue atlas), or copy the skill on the [data market](/getting-started/data-market.md). Related: [Genes](/getting-started/genes.md) and [Expression](/getting-started/expression.md).

## Search on the canvas

1. Open the node creator, select Duaer Data, then Tissue atlas.
2. Gene is required (a new node starts with INS). Tissue is optional (for example pancreas to keep matching tissues).
3. Limit defaults to 10, max 20; results sort by nTPM descending. Select Execute step.

A successful search uses 1 credit. Production deliverables land in the [data pool](/getting-started/data-pool.md).

## Call the API

- GET https://api.duaer.com/v1/data/atlas?...
- Authorization: Bearer <Duaer key>
- gene 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-atlas
description: >-
  Search Human Protein Atlas tissue-enriched expression through Duaer.
  One successful search uses 1 Duaer credit.
---

# Duaer tissue atlas

Search Human Protein Atlas tissue-enriched expression through Duaer with a Duaer key.

## Call

`GET https://api.duaer.com/v1/data/atlas?gene=INS&limit=10`

Header: `Authorization: Bearer <Duaer key>`

Use an account key or a model API key.

`gene` is required.

- `gene` — gene symbol or Ensembl id. Look up symbols with https://skills.duaer.com/genes.md.
- `tissue` — optional. Keep only enriched tissues whose name contains this text (for example `pancreas`).
- `limit` — optional. From 1 to 20. Default 10. Results sort by nTPM descending.

## Result

Each item has `source`, `title`, `url`, `summary`, `gene`, `ensemblId`, `description`, `tissue`, `nTPM`, `specificity`, `distribution`, `proteinClasses`, and `secretomeLocation`.
Reuse `gene` when searching proteins, genes, expression, or targets. For GTEx median TPM across tissues, use https://skills.duaer.com/expression.md.

## 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

### How does Duaer Tissue atlas differ from Expression?

Tissue atlas focuses on HPA enrichment and protein-side labels; Expression returns GTEx median TPM across tissues. Use both when you need both views.

## Related

- [Search expression in Duaer](https://doc.duaer.com/getting-started/expression.md)
- [Search genes in Duaer](https://doc.duaer.com/getting-started/genes.md)
- [Search proteins in Duaer](https://doc.duaer.com/getting-started/proteins.md)
- [Use the Duaer data market](https://doc.duaer.com/getting-started/data-market.md)