Activin inhibits pituitary prolactin expression and cell growth through Smads, Pit-1 and menin. - Lacerte,A.; Lee,E.H.; Reynaud,R.; Canaff,L.; De Guise,C.; Devost,D.; Ali,S.; Hendy,G.N.; Lebrun,J.J. (Mol Endocrinol, 2004)