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Microscopic images (20 ×) depicting cytolytic activity of activated PBMC towards HCT-116 (a–d) and SW620 (e–h) cancer cells. Unactivated PBMC (PBL) or PBMC preincubated with Con A (10 μg/ml) and D. oil (10 μg/ml) for 48 h were co-cultured with cancer cells to analyse their cancer cells killing efficiency. Cancer cells alone (a and e) were used to evaluate the natural cell death
