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Presence of monocilia on node cells of Dll1−/− mutant embryos. (A,B) Monocilia (some indicated with arrows) were detected by immunofluorescence with an antibody against acetylated tubulin. (C,D) Monocilia (arrows) were observed by scanning electron microscopy on both wild-type (C) and Dll1−/− mutant (D) node cells.
