TABLE 1.

Viral titers of retroviral vectors displaying TVTMs

Vector	Titer on NIH 3T3 cells (CFU/ml)a	Vector	Titer on NIH 3T3 cells (CFU/ml)a
CEE	1.7 × 108	CAE	5.6 × 106
CEE + TVTM1	1.7 × 107	CAE + TVTM2	0.6 × 106
CEE + TVTM2	1.6 × 108	CAE + TVTM2	1.5 × 106
CEE + TVTM3	5.8 × 107	CAE + TVTM3	0.8 × 106
CEE + TVTM4	1.9 × 107	CAE + TVTM4	0.6 × 106
CEE + TVTM5	2.5 × 107	CAE + TVTM5	2.2 × 106
CEE + TVTM6	1.9 × 107	CAE + TVTM6	2.5 × 106

^aResults are expressed as arithmetic means of duplicate determinations.