SKOV3 tumour cells (unlabelled) were co‐incubated with normal human dermal fibroblasts (NHDF; EpCAM‐negative, labelled red, serving as non‐target control cells) and PBMC‐derived T cells (labelled blue) in the presence of a caspase stain (CellEvent Caspase 3–7 reagent produces a green stain when caspases are activated). The gene discussed is CASP3; the disease is neoplasm.