The turkey transcription factor Pit-1/GHF-1 can activate the turkey prolactin and growth hormone gene promoters in vitro but is not detectable in lactotrophs in vivo.
Weatherly KL, Ramesh R, Strange H, Waite KL, Storrie B, Proudman JA, Wong EA. The turkey transcription factor Pit-1/GHF-1 can activate the turkey prolactin and growth hormone gene promoters in vitro but is not detectable in lactotrophs in vivo. Gen Comp Endocrinol. 2001 Sep; 123(3):244-53.