Human artificial chromosome (HAC) technology has developed rapidly over the past four years. Recent reports show that HACs are useful gene transfer vectors in expression studies and important tools for determining human chromosome function. HACs have been used to complement gene deficiencies in human cultured cells by transfer of large genomic loci also containing the regulatory elements for appropriate expression. And, they now offer the possibility to express large human transgenes in animals, especially in mouse models of human genetic diseases.
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