1 Balapure, A.K., Rexroad, C.E., Kawada, K., et al. Structural requirements for prostaglandin analog interaction with the ovine corpus luteum prostaglandin F2α receptor. Biochem Pharmacol 38 2375-2381 (1989). 2 Lake, S., Gullberg, H., Wahlqvist, J., et al. Cloning of the rat and human prostaglandin F2α receptors and the expression of the rat prostaglandin F2α receptor. FEBS Lett 355 317-325 (1994). 3 Stjernschantz, J., Resul, B. Phenyl substituted prostaglandin analogs for glaucoma treatment. Drugs of the Future 17 691-704 (1992).