3 aminopropanephosphonic acid 2 4 aminobutanephosphonic acid 2 4 aminobutyric acid B receptor 2 Adenohypophyseal cell cultures 2 Baclofen 2 Luteinizing hormone 2 Prolactin 2 adenohypophysis 2 animal cell 2 animal experiment 2 article 2 baclofen 2 controlled study 2 female 2 gonadotropin release 2 hypophysis cell 2 luteinizing hormone 2 luteinizing hormone release 2 monolayer culture 2 nonhuman 2 phaclofen 2 priority journal 2 prolactin 2 prolactin release 2 protirelin 2 rat 2