| The head region of the embryo is demarcated anterior to the node by the head fold, an infolding of the blastoderm composed of both ectoderm and endoderm. |
| It should be constituted as if formed of the fused edges of the blastoderm. |
| Normally occurring embryonic cell death is not present in wild-type blastoderm stage embryos. |
| There is one point to be noticed in the shape of the blastoderm as a whole. |
| Special focus has been on the pattern of early cleavage, blastoderm and germinal disc development and gastrulation. |
| Consistent with these findings, Sxl-Pe is not activated in germ cells of blastoderm embryos. |
