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Immune cytotoxicity against PDL1-positive MDA-MB-231 cells in vitro. MDA-MB-231 cells were cultured in the presence or the absence of PBMC. The cells were treated with polyA, BSA, PD-L1 aptamer, or BSA-Apt. The PBMC was subsequently washed off and tumor cells were evaluated for viability with standard MTS assay (n = 6). Single star indicates statistically significant differences (p < 0.05), and “ns” indicates no significance.
