Heat maps of pairwise Pearson correlation coefficients between the transcriptomic profiles of each of the 749 molecular cell types in the atlas (10x and SS2 datasets, excluding all cardiac cells), calculated from principal component values of FIRM-integrated UMAP averaged across all cells of each type, as described in the bioRxiv article. Cell types are ordered by compartment, then cell type annotation number, then tissue (a); by tissue, then compartment, then cell type annotation number (b); and by hierarchical clustering of cell type expression profiles (c).

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