Embryo organizer

Spemann's work demonstrated that individual cells in an embryo affect each other's development, and that cells can remain plastic late into embryogenesis. His experiments with dividing embryos provided insights into developmental biology, leading to the discovery of 'organizers' in embryos and earning him a Nobel Prize in 1935.
 Hans Spemann Germany 1918 Embryo organizer

Spemann's work demonstrated that individual cells in an embryo affect each other's development, and that cells can remain plastic late into embryogenesis. His experiments with dividing embryos provided insights into developmental biology, leading to the discovery of 'organizers' in embryos and earning him a Nobel Prize in 1935.