ब्लास्टोपोर इसके अंग्रेजी अर्थ का उदाहरण

Cells involuting further laterally in the blastopore, or entering via Hensen’s node and the anterior primitive streak, contribute to gut, notochord and somites.

Gastrulation then continues along the ventroposterior blastopore lip and posterior streak region, from where cells contribute to ventral and posterior mesoderm.

Adding to this, Brachyury and caudal homologues are expressed circumferentially around the blastopore lips in the frog, and along the primitive streak in chick and mouse.

This would suggest that, despite their different morphology, the amniote primitive streak and the amphibian blastopore are homologous structures, meaning that they have evolved from one and the same precursor structure by a continuous sequence of morphological modifications.

Therefore, the primitive node (the dorsal lip of the blastopore) secretes BMP antagonists, including noggin, chordin, and follistatin.

Its ancestral role, or at least the role it plays in the Cnidaria, appears to be in defining the blastopore.

In Xenopus laevis Xbra (the Xenopus T homologue, also recently renamed t) is expressed in the mesodermal marginal zone of the pre-gastrula embryo followed by localisation to the blastopore and notochord at the mid-gastrula stage.