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Analysis of cardiac arrhythmias in zebrafish popdc2 morphants. (A) Ventricular contractions are regular in control animals (CTR) but display 2:1 and 3:1 secondary AV block in popdc2 morphants (MO1). (B, C) Optical mapping of calcium waves in control and morphant hearts reveal aberrant calcium waves in Popdc2 morphants. From 111 with permission.
