primitive streak वाक्य
उदाहरण वाक्य
मोबाइल
- The absence of hypoblast results in multiple primitive streaks in chicken embryos.
- Hence, primitive streak is analogous to the blastopore lip in amphibian gastrulation.
- When the primitive streak forms, these cells expand out to become Hensen's node.
- This separation is crucial in the formation of the primitive streak.
- At the end of the second week, a primitive streak appears.
- The primitive streak is key in the development of the major body axes.
- Avian gastrulation occurs as cells move though the primitive streak.
- In chicken and mouse, Vg1 and Nodal respectively promote primitive streak formation in the epiblast.
- Koller's sickle induces primitive streak and Hensen's node, which are major components of avian gastrulation.
- The primitive streak develops from Koller s sickle and the epiblast of the avian embryo.
- The tissue undergoes convergent extension as the primitive streak regresses, or as the embryo gastrulates.
- The formation of the primitive streak, through which gastrulation occurs, is induced by Koller's sickle.
- Similarly, the posterior cells of Koller s sickle form the posterior region of the primitive streak.
- They are derived from the posterior primitive streak region of the mesoderm in the gastrulating embryo.
- Within birds and mammals, epiblast cells converge at the midline and ingress at the primitive streak.
- Callebaut and Van Nueten observed the formation of a normal secondary primitive streak, mesoderm, and definitive endoderm.
- In 1926, Ludwig Graper first studied the involvement of Koller's sickle in the formation of the primitive streak.
- As the cells of Koller s sickle migrate during gastrulation, they form different portions of the primitive streak.
- Even after implantation begins, a preembryo ( and proembryo ) may exist up until formation of the primitive streak.
- The anterior cells of Koller s sickle become the anterior region of the primitive streak, known as Hensen's node.
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