TABLE 1.

Host ranges and titers of HIV-1 lentiviral and MoMLV oncoretroviral vectors bearing the JSRV Env protein^a

Env source	Target cells	Species	Titer (AP+ FFU/ml) for indicated vector:
			Lentiviral	Oncoretroviral
JSRV	HTX	Human	1.1 × 104	4.2 × 104
	293	Human	5.0 × 104	3.8 × 104
	BEAS-2B	Human	2.9 × 104	2.5 × 104
	SSF	Sheep	7.5 × 104	1.0 × 105
	NIH 3T3	Mouse	<5	<5
	208F	Rat	<5	<5
VSV-G	HTX	Human	3.4 × 104	1.5 × 106

^aTiters of viral stocks were determined by infection of cells seeded the day before at 10⁵ cells per well of 6-well plates with serially diluted virus, and AP⁺ foci were counted 3 days after infection. The values shown are the means of the results of at least two experiments, and the variation in the results of the experiments was no more than 10%.