Table 1.

Reporter vector titer and expression in NIH 3T3 clones

Vector	Titer*	GFP expression†
MGPNS	3  × 106	32  ± 9
INS4(+)	2  × 106	90  ± 29
Ins4(−)	2  × 106	40  ± 18

^*Titer reported for best of 12 clones expressed as G418^r colony-forming units/ml on naive NIH 3T3 calls. 

^† Mean relative fluorescence determined by flow cytometric analysis of 9–12 independent transduced and G418-selected NIH 3T3 cell clones.