Fig 4. Comparison of heart rates and blood flow velocities of wildtype and klf2a ^sh317 mutant embryos at 48hpf (A) No significant differences in heart rates were observed. (B) Instantaneous blood flow velocities throughout a single cardiac cycle in wildtype and klf2a ^sh317 mutants. (C) Average instantaneous blood flow velocities per cardiac cycle (n = 24, unpaired t-test).