Dot Size: Represents the percentage of cells in each identity class that express the feature above a certain threshold (non-zero expression by default).
Dot Color: Reflects the z-score normalized average expression of the feature in that identity class. Darker colors typically indicate higher scaled average expression values.
Computes the correlation of genes with red color representing positive correlation and blue color representing negative correlation
The dendrogram represents the hierarchical clustering: genes that are closer together -> higher correlation and similar expression