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Updated: Mar 5, 2026

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Induction by the endoderm in birds.

C H Waddington1,2

  • 1Strangeways Research Laboratory, Cambridge, England.

Wilhelm Roux' Archiv Fur Entwicklungsmechanik Der Organismen
|March 30, 2017
PubMed
Summary
This summary is machine-generated.

The endoderm influences chick and duck embryo development by inducing form-building movements, not specific tissues. This interaction can alter primitive streak formation, leading to normal development, duplicated structures, or altered embryonic forms.

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Area of Science:

  • Developmental Biology
  • Embryology
  • Cell Biology

Background:

  • The primitive streak is crucial for early embryonic development in birds.
  • Interactions between embryonic layers guide morphogenesis.

Purpose of the Study:

  • To investigate the role of endoderm in epiblast development and primitive streak formation.
  • To determine if endoderm induces specific tissues or morphogenetic movements.

Main Methods:

  • Separation and reciprocal recombination of endoderm and epiblast layers in chick and duck embryos.
  • In vitro cultivation using the watch-glass technique.

Main Results:

  • Displaced endoderm significantly affected epiblast development, influencing primitive streak formation.
  • Observed outcomes included hindered growth, induction of secondary primitive streaks, and formation of double embryos or fused structures.
  • Endoderm's influence was primarily on morphogenetic movements rather than direct tissue differentiation.

Conclusions:

  • Endoderm plays a critical role in inducing the form-building movements essential for primitive streak development.
  • This study suggests endoderm's inductive capacity lies in guiding cellular movements, shaping embryonic form.