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Fig. 7. Blood pressure and blood flow in homozygous bre zebrafish mutants (A,C,D) and blood pressure in wild-type zebrafish (B) (2.5-3 d.p.f.). (A) Blood pressure in the ventricle and in the ventral artery. Horizontal bars show duration of atrial contractions. Dotted line, trace of blood pressure in the ventral artery; *atrial contraction; {dagger}second atrial contraction. (B,C) Blood pressure in the ventricle and in the bulbus arteriosus. (D) Blood flow to the heart, measured by video imaging in the sinus venosus. Horizontal black bars, duration of atrial contractions.