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Dynamics of the organizer . A . Morphogenetic movements and specificities in induction and differentiation of the organizer
- Publisher
- Wiley
- Copyright
- Copyright © 1987 Wiley Subscription Services, Inc., A Wiley Company
- ISSN
- 0012-1592
- eISSN
- 1440-169X
- DOI
- 10.1111/j.1440-169X.1987.00535.x
- Publisher site
- See Article on Publisher Site
Abstract
A piece of ectoderm was taken from the neural plate area of an early neurula (Ambystoma mexicanum) and replaced by competent gastrula ectoderm. Neural tissue was induced in these transplants, and the amount of neural tissue was used to estimate the spreading of the neural inductive stimulus. Dependence was tested of the amount of neural tissue formed in the transplants on the following factors: distance of the transplant from the dorsal midline of the host, age of the host, age of the transplant. The first two factors had no influence on the results but age of the transplant turned out to be decisive. The distance of the transplant from the midline of the host did not influence the amount of neural tissue found in the transplant, even in transplants out side the normal neural plate area neural differentiation was induced. It is concluded that the spreading of neural induction is not controlled by a gradient but by the loss of neural competence of the ectoderm. A model for the spreading of neural induction is suggested using competence and homoiogentic induction as its main factors.
Journal
Development, Growth & Differentiation – Wiley
Published: Oct 1, 1987