Adding tumour cells, which activate fibroblasts (Fig EV3E and (Apte & Wilson, 2012)), rescues FAK‐KD fibroblast velocity to levels observed with FAK‐WT fibroblasts co‐cultured with tumour cells (Fig 5C), but not their loss of directionality (Fig 5D). The gene discussed is PTK2; the disease is neoplasm.