Table 2.

Concentration and specific activity of IFNα preparations used in this study

Human IFNα	Nanodrop 2000 Spectrophotometer, concentration (mg/mL)	RPE-ISRE-Luc reporter cells, specific activity (U/mg)
1	0.21	3.24 × 109
2	1.11	7.06 × 107
4	0.21	4.20 × 108
5	1.79	1.12 × 107
6	0.17	2.56 × 107
7	0.12	2.42 × 107
8	0.62	3.29 × 106
10	0.17	3.42 × 108
14	0.35	1.63 × 108
16	0.32	4.67 × 106
17	0.21	4.50 × 108
21	0.19	2.32 × 108