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Fig. S2
Expanded expression of tbx2b in frv mutants. (A,B) Frontal views depicting expression of tbx2b at 48 hpf in wt (A) and frv mutant (B) embryos. Dotted lines outline the chambers flanking the AVC; brackets demarcate the extent of tbx2b expression. Expression of tbx2b is normally restricted to AVC myocardium (A), but it expands into the cardiac chambers in frv mutants (B). A, atrium; V, ventricle. Scale bar: 50 μm.
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