A novel Human Cytomegalovirus vector system is provided. The vector system is characterized by an amplicon vector, having an HCMV derived origin and cleavage packaging signal, and a helper virus function. The vector system is capable of infecting a wide range of host cells, including human CD34.sup.+ hematopoietic progenitor cells. Methods, including therapeutic and prophylactic methods, for introducing heterologous polynucleotide sequences into cells using the vector system are also provided.

 
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< Homogeneous preparations of IL-28 and IL-29

> Homogeneous preparations of IL-28 A

> Minimally immunogenic variants of SDR-grafted humanized antibody CC49 and their use

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