Zebrafish embryos were fixed with 4% paraformaldehyde and analyzed by whole mount in situ hybridization using the protocol described previously[44 (link)]. The following antisense riboprobes were generated in this study: spaw[45 (link)], myl7[46 (link)] and foxa3[47 (link)]. Whole mount immunofluorescence was performed to detect monocilia in Kupffer’s vesicle as described[48 (link)]. Acetylated tubulin monoclonal antibody (1:1000; Sigma) and Cy3-conjugated anti mouse IgG antibody (1:500; Jackson ImmunoResearch Laboratories) were used in this study. Images were acquired on a Zeiss LSM700 confocal microscope. Images were processed using ImageJ software (NIH).
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