Figure 2. 3D time-lapse series of X. laevis embryo during mid-gastrulation.
a–f, Mid-sagittally (a–c) and mid-horizontally (d–f) halved embryo renderings at stages 11.5 (0 min), 12 (62 min) and 12.5 (114 min). Ectoderm (blue), mesoderm (orange), and endoderm (green). g–i, Velocity fields on a 180-μm-thick 3D slab centred about the cutting planes of (a–c). Colour bar indicates velocity magnitude representation. Animal pole (AP), Archenteron (ARC), Brachet’s cleft (BC), blastocoel (BLC), blastocoel floor (BLCF), blastocoel roof (BLCR), blastopore (BP), dorsal and ventral sides (D, V), dorsal and ventral blastopore lip (DBL, VBL), ‘pipe’ system in-between archenteron and blastocoel (PS), ventral animal pole (VAP) and vegetal pole (VP).