SERPINF1 and choroidal neovascularization: We found that: (a) the expression of ATP1B1 (the Na+/K+‐ATPase β1 subunit) was reduced significantly in RPE from aged mice, in patients with CNV (Choroidal Neovascularization) and in DKO mice; (b) the expression of PEDF also was decreased in aged persons and in DKO mice; (c) the TEP across RPE was reduced markedly in RPE cells from DKO mice and (d) an applied electric field (EF) of 50‐100 mV/mm, used to mimic the natural TEP, increased the expression and secretion of PEDF in primary RPE cells.