Cardiomyocyte number is unchanged between siblings and uq 23ks mutants. A: Confocal imaging of sibling and uq 23ks mutants on the Tg(myl7:nls‐dsRed) background at 48 hpf. B: Dot plots quantifying the total number of cardiomyocytes observed in embryonic hearts show no significant (ns) difference between sibling and uq 23ks mutants at 48 hpf, suggesting a difference in cell proliferation or differentiation is not contributing to the uq 23ks phenotype. C: Quantification of cell number per area, however, is significantly higher in uq 23ks mutants compared with siblings, consistent with smaller cardiomyocyte size in uq 23ks mutants. mean ± SEM. n.s. = not significant; **P < 0.01.
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