Endangered Przewalski’s horse, <i>Equus przewalskii</i> , cloned from historically cryopreserved cells

Abstract Two endangered Przewalski’s horse stallions were cloned from fibroblast cells cultured and cryopreserved in 1980. These stallions are clones of a male that lived from 1975-1998 that pedigree analyses identified as a genetically valuable male for present-day conservation breeding. This is the first time that multiple healthy clones have been produced for an endangered species.