Willott E, Balda MS, Heintzelman M, Jameson B, Anderson JM. Localization and differential expression of two isoforms of the tight junction protein ZO-1. American Journal of Physiology-Cell Physiology. 1992 May 01;262(5):C1119–24. doi: 10.1152/ajpcell.1992.262.5.c1119.