Retraction concerning an endothelin B receptor-selective antagonist: Urade, Y., Fujitani, Y., Oda, K., Watakabe, T., Umemura, L., Takai, M., Okada, T., Sakata, K. and Karaki, H. (1992) FEBS Lett. 311, 12-16 : An endothelin B receptor-selective antagonist: IRL 1038, [Cys11-Cys15]-endothelin-1(11-21)