Table 1. Transfection Efficiencies of C₆₀/DNA Transfection Mixtures at Various R Values Presented as a Quotient of GFP-Fluorescent Cells Relative to the Total Number of Cells Analyzed as Measured by Flow Cytometry^a.

	transfection efficiency (%) at various R values
C60 vector	R = 0.42	R = 4.2	R = 8.4	R = 16.8	R = 42
IV	0.53 ± 0.13	0.42 ± 0.18	1.32 ± 0.57	31.33 ± 4.24	2.40 ± 0.13
III	0.43 ± 0.31	0.37 ± 0.21	0.99 ± 0.15	28.33 ± 4.94	1.86 ± 0.24
II	0.30 ± 0.20	0.58 ± 0.14	0.60 ± 0.13	0.32 ± 0.06	0.41 ± 0.17
I	0.27 ± 0.15	0.45 ± 0.28	0.62 ± 0.10	0.34 ± 0.04	0.43 ± 0.14
V	0.17 ± 0.12	0.36 ± 0.27	0.23 ± 0.10	0.11 ± 0.03	0.09 ± 0.05
VI	0.27 ± 0.21	0.15 ± 0.06	0.48 ± 0.25	0.10 ± 0.01	0.14 ± 0.04
naked DNA	0.01 ± 0.005
PEI (25 kDa)	28.7 ± 3.5
Cytopure	35.2 ± 5.1

^a10,000 events were counted for each sample. C₆₀ vectors are listed in order of their measured efficiency at promoting transfection in NIH 3T3 cells under serum-free conditions.