Fig. 2: Cardiomyocytes.

a, UMAP embedding of five ventricular cardiomyocyte (vCM) populations. b, Regional distributions of ventricular cardiomyocyte populations. Data are available in Supplementary Table 5. AX, apex; LV, left ventricle; SP, interventricular septum; RV, right ventricle. c, d, Multiplexed smFISH of PRELID2 (red) enriched in vCM2 (c) and of FHL1 (red) enriched in vCM3 (d). e, UMAP embedding of five atrial cardiomyocytes (aCM) populations. f, Regional distributions of atrial cardiomyocyte populations. LA, left atrium; RA, right atrium. g, h, Multiplexed smFISH of HAMP (red) enriched in aCM2 (g) and of CNN1 (red) enriched in aCM3 (h). In c, d, g and h, nuclei are counterstained with DAPI (dark blue). Scale bars, 10 μm. For details on statistics and reproducibility, see Methods.