Gene expression of liver-specific functions in immortalized and reverted cells. Lines 1 to 7, from left to right, Marker, Albumin’ (immortalized hepatocytes), Albumin (reverted hepatocytes), GAPDH’ (immortalized hepatocytes), GAPDH (reverted hepatocytes), SV40T’ (immortalized hepatocytes), SV40T (reverted hepatocytes), respectively.