The pan-pituitary activator of transcription, Ptx1 (pituitary homeobox 1) acts in synergy with SF-1 and Pit-1 and is an upstream regulator of the Lim-homeodomain gene Lim3/Lhx3 - Tremblay,J.J.; Lanctot,C.; Drouin,J. (Mol Endocrinol, 1998)