SLC6A7 and lung carcinoma: Immunoblot analysis also shows that TGF‐β‐induced upregulation of EMT‐associated molecules, including N‐cadherin, Snail, Twist1, and ZEB1, was abrogated by ProT overexpression in A549 (Fig. 2C) and H1299 (Fig. 2D) human lung cancer cells.