# Marker Genes This module is similar to [Gene Expression](/documentation/analyses/analysis-workbench/gene-expression.md), in the sense that it is used for plotting gene expression while grouping by an observation. However, there are several distinctions. 1. Plots a heatmap and individual violin plots for each gene. 2. Does not compute pseudobulk for single-cell data. 3. Allows for grouping by any dataset observation, not just org-level metadata fields. 4. Requires a [standard runtime](/documentation/compute-runtimes/codeless-compute.md). A typical use case is plotting cell type marker genes across Leiden clusters to annotate cells. ## Video demonstration --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://documentation.panomics.bio/documentation/analyses/analysis-workbench/marker-genes.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.