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The Hypoblast of the Chick Embryo Positions the Primitive Streak by Antagonizing Nodal Signaling

✍ Scribed by Federica Bertocchini; Claudio D. Stern


Book ID
117795268
Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
419 KB
Volume
3
Category
Article
ISSN
1534-5807

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Initiation of the primitive streak in avian embryos provides a well-studied example of a pattern-forming event that displays a striking capacity for regulation. The mechanisms underlying the regulative properties are, however, poorly understood and are not easily accounted for by traditional models

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## Abstract Fresh pullet eggs (White Leghorn Strain) were incubated to obtain the primitive streak stage of development. Blastoderms were fixed in situ with isotonic aldehyde fixatives and prepared for scanning electron microscopy by means of postosmication, critical point drying and gold‐palladium