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1. Spemann and Mangold's organizer graft	1924
		1929	2. Fate mapping
3. Notch signalling and lateral inhibition	1937

4. Mathematical modelling	1952	1952	5. Nuclear reprogramming and cloning

		1957	6. Limb outgrowth and patterning

7. Sperry's chemoaffinity hypothesis	1963
		1969	8. Mesoderm induction

		1971	9. Human assisted reproductive technology

10. Caenorhabditis elegans cell lineage	1977

11. Homeotic genes and colinearity	1978
		1980s	12. Transgenics and gene knockouts
13. Genetic screens in Drosophila melanogaster	1980

14. Embryonic stem cells	1981

15. Programmed cell death	1986	1986	16. Morphogen gradients

17. Development and cancer	1987
		1988	18. Asymmetric cell division

19. Neural induction	1989

		1990	20. Biology of the sex chromosomes

		1991	21. The floor plate and Sonic hedgehog

22. Body axis coordination	1995	1995	23. Left-right patterning

24. Somitogenesis and molecular clocks	1997

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