Ricki Lewis | Mar 5, 2000 | 5 min read
When Science voted stem cell research its 1999 Breakthrough of the Year, the congratulatory article traced the field's origin to the 1981 successful culture of mouse embryonic stem (ES) cells.1,2 But the roots of exploring these multipotential cells go back considerably farther, to a little-mentioned researcher who worked with mice at the Jackson Laboratory in Bar Harbor, Maine. Photo: Jackson LaboratoryLeroy Stevens Leroy Stevens arrived at the lab in 1953, a newly minted developmental b