Sensitivity of optical action potentials recorded in cardiomyocytes derived from human induced pluripotent stem cells to a range of drugs. - Ghouri, I. A.; Hortigon-Vinagre, M. P.; Wallis, R.; Burton, F. L.; Cooper, J.; Craig, M.; Anson, B. D.; Smith, G. (Proceedings of the Physiological Society, 2013)