HCEC-B4G12 is a clonal subpopulation started in 2005 from the parental cell line HCEC-12 established from normal cells of the posterior epithelium of the cornea of a 91-year-old Caucasian woman transformed with the early region of the SV40 genome including genes encoding large T-antigen and small t-antigen; the subclone is described to represent differentiated cells of the so-called corneal endothelium