FN1 and polycystic kidney disease 2: The Polycystin‐1 interactors were as follows: talin‐1 (TLN1); Polycystin‐2 (PKD‐2), beta catenin (CTNNB1); keratin‐18 (KRT‐18); fibronectin (FN1); and the alpha I chain of collagen (COL1A).