Identification of an antagonist that selectively blocks the activity of prostamides (prostaglandin-ethanolamides) in the feline iris. - Woodward, D. F.; Krauss, A. H.; Wang, J. W.; Protzman, C. E.; Nieves, A. L.; Liang, Y.; Donde, Y.; Burk, R. M.; Landsverk, K.; Struble, C. (British Journal of Pharmacology, 2007)