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Figure 4: Effect of PC-SPESII on breast cancer cell viability. MTT assay was performed to measure cell survival (by percent) in response to PC-PSESII treatment. MDA-MB-231 cells were treated with the indicated amounts of PC-SPESII for 24, 48, or 72 hours. Results are presented as means ± SD of three independent experiments and SD are denoted by error bars (** compared to untreated control).