Nieuwkoop, Pieter D. (Pieter Dirk)

Germ Layers

Germ Layers

A germ layer is a group of cells in an embryo that interact with each other as the embryo develops and contribute to the formation of all organs and tissues. All animals, except perhaps sponges, form two or three germ layers.

General Embryological Information Service, published annually by the Hubrecht Laboratory, 1949-1981

General Embryological Information Service, published annually by the Hubrecht Laboratory, 1949-1981

The General Embryological Information Service (GEIS) was an annual report published by the Hubrecht Laboratory in Utrecht, The Netherlands from 1949 to 1981 that disseminated contemporary research information to developmental biologists. The purpose of the annual report was to catalog the names, addresses, and associated research of every developmental biologist in the world.

Endoderm

Endoderm

Endoderm is one of the germ layers—aggregates of cells that organize early during embryonic life and from which all organs and tissues develop. All animals, with the exception of sponges, form either two or three germ layers through a process known as gastrulation.

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