Compositions comprising host cell specific adenovirus vehicles are provided for transfecting target host cells. The compositions comprise replication competent adenovirus having an adenovirus gene essential for replication under transcriptional control of a cell type specific transcriptional response element (TRE) and polyethylene glycol (PEG) as a masking agent.

 
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> Method for in vitro propagation of the agent responsible for transmissible spongiform encephalopathies

> Method of collection of fragrance ingredient, perfume composition containing this fragrance ingredient and cosmetics containing this fragrance ingredient
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