. 2014 Mar 14;9(3):e92128. doi: 10.1371/journal.pone.0092128

Table 2. IC50 values of studied Cyclopia sp. extracts, calculated with RTCA.

Cyclopia sp. extract	HeLa IC50 and R²	HaCaT IC50 and R²
C	1.458 μg/ml; R² = 0.946	6.76 μg/ml; R² = 0.921
D	13.30 μg/ml; R² = 0.978	18.45 μg/ml; R² = 0.937
E	1.667 μg/m; R² = 0.981	5.26 μg/m; R² = 0.9876
F	10.60 μg/ml; R² = 0.993	17.38 μg/ml; R² = 0.945

IC50 values were calculated in RTCA software, with use of non-linear regression (sigmoidal dose response model). Each extract concentration was tested in triplicate and experiments were repeated twice.