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Nature Biotechnology 22, 693–694 (1 June 2004) | doi:10.1038/nbt975

Serial bull cloning by somatic cell nuclear transfer

Chikara Kubota , X Cindy Tian & Xiangzhong Yang

Although the list of species successfully cloned continues to grow, serial cloning has not been reported in species other than the mouse. Here we describe two live births of second-generation clones of a bull.