> ## Documentation Index
> Fetch the complete documentation index at: https://docs.adaptyvbio.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Expression

> Test and quantify expression for your designed proteins.

## What you get

* **Expression call:** Expressed / low / not detected
* **Relative yield:** Comparable signal per variant for quick triage
* **QC summary:** Flags for insolubility or tag issues

## How it works

We run your sequences through our standardized cell‑free expression workflow and detect expression via tag‑based readouts. Results land in your dashboard and API with clear calls and QC.

## When to use

* Before binding or activity campaigns to avoid running non‑expressers
* During library exploration to focus on productive designs

<Steps>
  <Step title="Prepare sequences">Upload sequences via the platform or API.</Step>
  <Step title="Cell‑free expression">We run standardized expression with tag detection.</Step>
  <Step title="QC & calls">You get expression calls, relative yield, and QC flags.</Step>
</Steps>

<Callout>
  Ready to set up an expression run? Visit <a href="https://start.adaptyvbio.com/expression" target="_blank" rel="noreferrer">start.adaptyvbio.com/expression</a>.
</Callout>

## Related pages

* [Binding](/docs/experiment-types/binding)
* [Thermostability](/docs/experiment-types/thermostability)