The Use of Ratiometric Fluorescence Measurements of the Voltage Sensitive Dye Di-4-ANEPPS to Examine Action Potential Characteristics and Drug Effects on Human Induced Pluripotent Stem Cell-Derived Cardiomyocytes. - Hortigon-Vinagre, M. P.; Zamora, V.; Burton, F. L.; Green, J.; Gintant, G. A.; Smith, G. L. (Toxicological Sciences, 2016)