Interestingly, in the short list of the 20 genes the most upregulated in each of the three screened 6.5/cancer cells, we found TGFB2 that encodes TGF-β2, which belongs to the family of transforming growth factors often associated with cancer cell invasiveness and the epithelial-mesenchymal transition (EMT)35, and FST (follistatin), a gene under the control of TGF-β236 (Fig. 3a). Here, FST is linked to cancer.