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Recently, sheep (Wilmut et al., 1997), mice (Wakayama et al., 1998; Wakayama and Yanagimachi, 1999) and cows (Kato et al., 1998; Cibelli et al., 1998; Wells et al., 1999) have been cloned from several adult cell types, including mammary gland (Wilmut et al., 1997), cumulus (Kato et al., 1998;