TGFB1 and neoplasm: The TGFβ SNIPR is specific to the active versus the latent form of TGFβ (Extended Data Fig. 1f), suggesting that it holds potential for tumour microenvironment detection19, and was cross-reactive across human TGFβ isoforms, albeit with a preference for TGFβ1 (Extended Data Fig. 1g).