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Blastoderm
A blastoderm (germinal disc, blastodisc) is a single layer of embryonic epithelial tissue that makes up the blastula. It encloses the fluid-filled blastocoel. Gastrulation follows blastoderm formation, where the tips of the blastoderm begins the formation of the ectoderm, mesoderm, and endoderm.[[File:Blastula (PSF) en rotate 05.jpg|right|200px]]
Formation
The blastoderm is formed when the oocyte plasma membrane begins cleaving by invagination, creating multiple cells that arrange themselves into an outer sleeve to the blastocoel.
In [[oviparous]] animals
In chicken eggs, the blastoderm represents a flat disc after embryonic fertilization. At the edge of the blastoderm is the site of active migration by most cells.
DNA repair genes are highly expressed in chicken blastoderms.
References
References
- (2000). "Developmental Biology". Sinauer Associates.
- "blastoderm".
- (27 March 2019). "Tutorial on chick early development". University College London.
- (2014). "Atlas of Chick Development". Academic Press.
- (January 2022). "Chicken blastoderms and primordial germ cells possess a higher expression of DNA repair genes and lower expression of apoptosis genes to preserve their genome stability". Sci Rep.
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