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Changes in the cell coat at the onset of gastrulation inXenopus laevis embryos

✍ Scribed by Johnson, Kurt E.

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
406 KB
Volume
199
Category
Article
ISSN
0022-104X

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✦ Synopsis

Abstract

Four developmental stages of Xenopus laevis embryos were fixed in standard electron microscopic fixatives with 1% lanthanum nitrate added. This treatment reveals a lanthanum staining material (LSM) on the cell surface and in extracellular spaces. Morula and blastula stage cells have a small amount of LSM; in blastulae, 3Β±3 SD % of the cell surface is coated with LSM. In early gastrulae, 29Β±6 SD % of the cell periphery is covered with LSM. In late gastrulae, 82Β±13 SD % of the cell periphery is either coated with LSM or faces a space with LSM in it. There is also an appreciable accumulation of LSM within extracellular spaces during gastrulation.

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