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Fig. 1. Zebrafish valves form through invagination. Larvae were stained with
rhodamine-phalloidin and imaged using confocal microscopy at 76 (A) or
62 (E) hpf, or imaged using SPIM at 76 (B), 85
(C,D) or 63 (F) hpf. Although by confocal microscopy a
superior endocardial cushion appears to be present (panel A), SPIM imaging
shows that this structure is actually a valve leaflet (B-D). Arrow in panel A
points to the presumed endocardial cushion and that in D to the valve leaflet.
No intermediate stage of mesenchymal cells was observed by either confocal (E)
or SPIM imaging (F). A, atrium; V, ventricle.