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Is the Tat protein (which is required for packaging of pGIPZ because of the wt 5' LTR) secreted by the packaging cells into the media?

Yes, Tat is secreted by the packaging cells and it can affect the expression of eukaryotic genes. If you think this may be a problem when transducing your target cells, you can concentrate the virus, which will separate the viral particles from any cellular proteins (including Tat).