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Leroy Stevens discovers the first embryonic stem cells through the study of mice teratomas. 

1953

The term "stem cells" first appears in scientific literature in the works of Ernst Haeckel

1868

John Gurdon clones tadpoles from an enucleated fertilized egg and a somatic nucleus

1962

1998

2001

2006

2001

1996

Ian Wilmut successfully clones the first sheep, whom he named "Dolly".

James A. Thompson creates human embryonic stem cells after experimenting with monkeys.

Takashi Tada shows that embryonic stem cells have genes that can reprogram somatic cells.

U.S. President George W. Bush allows 21 human embryonic stem cell lines to be researched.

Shinya Yamanaka proves skins cells from mice can be reprogrammed into immature stem cells.

2007

James A. Thompson creates a human iPSC from human fibroblasts using 4 genes.

2007

Shinya Yamanaka also proves that the reprogramming of skin cells is possible using 4 different genes.

A History of iPSC

2006

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