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cell line for lentivirus titration - (Dec/05/2005 )

I'm using invitrogen's virapower system to make lentiviruses and am wondering if there's a list of good cells to use for titration, except for the ones they recommend as I don't want to buy any in.
I'm using a specific cell line to transduce my viruses but they give me very low titres and I wondered if the titre would be more like the manufacturer's if I tried a different cell type. I don't want to have to go through all the cell types in the department so any suggestions?

-Dr JJ-

Which lentivirus are you talking about? Any idea on which receptor it is using to get into the cells?