prolactin release rat 54 nonhuman 52 Prolactin 50 article 50 priority journal 50 Rats 44 Female 40 prolactin 40 animal experiment 38 controlled study 38 female 34 animal cell 28 Animal 26 Animals 26 Male 24 male 24 Support, Non-U.S. Gov't 22 adenohypophysis 22 animal tissue 22 hypophysis cell 22 Pituitary Gland, Anterior 18 Rats, Inbred Strains 16 endocrine system 16 Pituitary Gland 14 Rats, Sprague-Dawley 14 animal model 14 protirelin 14 Mice 12 RNA, Messenger 12