Fig. 4
Pontin is essential for cilia motility. (A,B) Kymographs showing the rhythmic beating of motile cilia bundles in the pronephric tubule region (A) and olfactory placode (B) in wild-type zebrafish embryos at 3 dpf. pontinhi1055B/hi1055B mutants (MUT) lack cilia motility. 10 wild-type and 9 pontinhi1055B/hi1055B mutant embryos were observed. (C) Transmission electron micrographs of transverse sections of cilia in the pronephric tubule in wild type and pontinhi1055B/hi1055B mutants at 5 dpf. Black arrowhead, outer dynein arm (ODA); red arrowhead, inner dynein arm (IDA). (D) Reduced number of ODAs, IDAs and total dynein arms per cilium section in pontinhi1055B/hi1055B mutants in comparison with wild-type siblings. n=25. **P<0.01.