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"Cellular death in morphogenesis of the avian wing" (1962), by John W. Saunders Jr., et al.
By: Lijing Jiang
| Published: Mar 07, 2014
In the early 1960s, John W. Saunders Jr., Mary T. Gasseling, and Lilyan C. Saunders in the US investigated how cells die in the developing limbs of…
Cell DeathChickens--EmbryosApoptosisExperiments
Essay: Homology
By: Ingo Brigandt
| Published: Nov 23, 2011
Homology is a central concept of comparative and evolutionary biology, referring to the presence of the same bodily parts (e.g., morphological…
Homology (Biology)Morphology
The Carapacial Ridge of Turtles
By: Guido Caniglia
| Published: Jan 01, 2012
Two main elements characterize the skeletal morphology of turtles: the carapace and the plastron. For a turtle, the carapacial ridge begins in the…
TurtlesMorphology (Animals)EmbryosGerm CellsEmbryology
Cerebral Organoid as a Model System in the Study of Microcephaly
By: Dasia Garcia
| Published: May 12, 2017
Scientists use cerebral organoids, which are artificially produced miniature organs that represent embryonic or fetal brains and have many properties…
TechnologyMicrocephalyBrainNeuronsBrain--Diseases--Animal models
Hamburger-Hamilton Staging Series (1951)
By: Maria Doty
| Published: Jun 10, 2011
In 1951 Viktor Hamburger and Howard Hamilton created an embryonic staging series from a combination of photographs and drawings from other…
Chicks
James G. Wilson's Six Principles of Teratology
By: S. Alexandra Aston
| Published: May 23, 2014
James Graves Wilson's six principles of teratology, published in 1959, guide research on teratogenic agents and their effects on developing organisms…
TeratologyAbnormalities, HumanCongenital AbnormalitiesBirth DefectsCongenital Defects
Beatrice Mintz (1922–2022)
By: Adam R. Navis
| Published: Jan 21, 2009
Beatrice Mintz is a brilliant researcher who has developed techniques essential for many aspects of research on mouse development. She produced the…
PeopleBiographyMiceCancer
Brian K. Hall (1941- )
By: Editorial Team, EP
| Published: Jul 07, 2009
Brian Hall is the son of Doris Garrad and Harry Hall, and was born in Port Kembla, NSW Australia, on 28 October 1941. He attended the University of…
Neural CrestBiography
Syncytial Theory
By: Adam R. Navis
| Published: Oct 30, 2007
The syncytial theory of neural development was proposed by Victor Hensen in 1864 to explain the growth and differentiation of the nervous system.…
Hensen, Victor, 1835-1924Nervous SystemNeurons
Ernst Haeckel's Biogenetic Law (1866)
By: M. Elizabeth Barnes
| Published: May 03, 2014
The biogenetic law is a theory of development and evolution proposed by Ernst Haeckel in Germany in the 1860s. It is one of several recapitulation…
EvolutionDevelopmental BiologyEmbryologyAnatomy, Comparative