egg in the ovary. Wakayama's name for his new creation: Cumulina. (Lemonick) His technique was almost identical to Wilmut's except for two key steps. First, instead of using electric shocks to coax an adult cell into merging with a host egg whose nucleus had been removed, Wakayama injected just the adult nucleus into a nucleus-free host. And second, he let the hybrid cell sit for up to six hours before stimulating it to start dividing. (Lemonick) Where Wilmut got only a single cell to flower into an embryo and then a full-term fetus, Wakayama got dozens; up to 3% of his clones survived. That may be in part because his technique treated the cells more gently. It's also possible that injecting just the nucleus introduced fewer contaminants into the host cell. (Lemonick) Whatever the reason, the cloned mice were perfectly normal in all respects. They could mate and give birth, and their DNA was so robust that they themselves could be cloned--and their clones cloned. So far, Wakayama and his colleagues at the University of Hawaii have produced thre
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