Oocytes are a source of catecholamines in the primate ovary: Evidence for a cell-cell regulatory loop. - Mayerhofer,A.; Smith,G.D.; Danilchik,M.; Levine,J.E.; Wolf,D.P.; Dissen,G.A.; Ojeda,S.R. (Proc Natl Acad Sci USA, 1998)