# 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.

## 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.

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