TWNK and cancer: Nonetheless, some cells with fluorescence indistinguishable from that in control cancer cells were seen in all experiments other than in experiment ‘c’, where all U2OS, MM200-B12, NM39, WM175, COLO316 and PEO1 were found to have received fluorescence from fibroblasts (Table 1, Figure 3, Figure 4 and Figure 5, Supplementary Materials Figures S1–S8).