Conditional inactivation of the MEN1 gene leads to pancreatic and pituitary tumorigenesis but does not affect normal development of these tissues. - Biondi,CA.; Gartside,MG.; Waring,P.; Loffler,KA.; Stark,MS.; Magnuson,MA.; Kay,GF.; Hayward,NK. (Mol Cell Biol, 2004)