TGFB1 and neoplasm: MDA.Gluc tumours infected with a TGF‐β/SMAD signalling reporter (Ad‐CAGA‐Fluc) were injected with vehicle or 10 μg CAF‐sEV total protein (2 ng TGF‐β activity) and the TGF‐β/SMAD signalling activity was quantified by In Vivo Imaging System (IVIS) (Figure 7a).