In silm656 mutant embryos at 1 dpf (D), tnnc1a expression is found throughout the heart as in wild-type (WT) embryos (A). However, by 2 dpf, the expression of tnnc1a in silm656 embryos (E, F) has become diffuse compared to wild-type (B, C). No tnnc1a expression can be detected in silsk25 mutant embryos either at 1 or 2 dpf (G-I).