![]() The planes of sections are indicated by dotted lines on the whole-mount view of each embryo. A1-4, B1-3, C1-3, D1-4: sections of embryos shown in A, B, C, D respectively. orbicularis embryos after in situ hybridization with the Brachyury probe (A–B, D–H: dorsal views C: ventral view). orbicularis.Ī–C, D–H: whole mount views of E. Scale bar : 500 µm.īrachyury expression during gastrulation in E. bl, blastocoel h, hypoblast bp, blastoporal plate e, epiblast. ![]() A–C, D–F : sagittal sections of respectively stage 0a and 0b embryos G–L : transverse sections of a late stage 0b embryo. Black arrowheads indicate the blastoporal cavity or canal. Section J is a tangential section of this protrusion. Red arrowheads in J points to a characteristic protrusion of the dorsal lip, which starts to form at stage 0b and appears as a narrow extension between the lateral lips at late stage 0b. The approximate location of the sections shown in G–L are also shown on a tranverse section (F) of a slightly younger embryo to help interpretation of the histologies. The level and plane of sections shown in A–L are indicated by dotted lines on the schematic views. Schematic dorsal views of turtle embryos at stages 0a to late 0b (0b+) are shown in the upper line, with the area opaca in blue and the area pellucida in white. Histological characteristics of stage 0 E. The mode of gastrulation in each group is shown on the right, as reviewed in. The phylogenetic relationships between the major amniote taxa are taken from. Gastrulation patterns of the major tetrapod groups.
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