TABLE 1.

CIs for the combination of PI-1 and IFN-α at three different ratios in Loewe additivity model^a

PI-1 (nM)/IFN-α (U/ml) ratio	CI values at:
	ED50	ED75	ED90
2:1	0.49	0.65	0.91
6:1	0.86	0.79	0.74
18:1	0.86	0.78	0.73

^aED₅₀, ED₇₅, and ED₉₀ are the EDs of the compounds required to achieve 50, 75, and 90% inhibition, respectively. The CI values at various percentages of inhibition were calculated with the CalcuSyn program, as described in Materials and Methods.