> For the complete documentation index, see [llms.txt](https://documentation.panomics.bio/documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://documentation.panomics.bio/documentation/analyses/analysis-workbench/gene-expression.md).
# Gene Expression
The gene expression module offers users a quick way to visualize expression without needing a [`Standard Compute`](/documentation/compute-runtimes/codeless-compute.md) runtime.
## Create gene expression tile
To create a gene expression tile, click on the `Add Gene Expression Tile` button and fill in the form.
* **Subset** (optional)\
Create a new data slice or select an existing one to visualize expression on a subset of your samples.
* **Gene Input** (required)\
Manually input comma separate genes or select an existing gene list. The mean expression is used.
* **Group by** (required)\
Select one or more observations to group your expression values.
* **Color by** (optional)\
Color each data point with the observation selected.
* **Description** (optional)\
Provide additional context for your team members.
Add gene expression tile
## View existing gene expression tiles
Gene expression tiles support sample stratification by z-score. Click on the `View by Sample` button to view the z-score for each gene in your tile, for each sample.
