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Combination Index for two extract treatment
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Combination Index (CI) values for C2 (A), CMT-12 (B), and D17 (C) cell lines treated with TE and RE in combination at doses of 0.8, 1.7, 3.1, 6.3, 12.5, and 25.0 μg mL−1. CI values ≤ 0.9 indicate synergism (bold values), a CI value >0.9 and <1.1 indicates an additive effect, and CI values ≥1.1 indicate antagonism (italicized values). NP = no calculation possible due to antagonism with single extract alone (RE)
