Endorphinsbeta-EndorphinPituitary Glandbeta-LipotropinNaloxoneEnkephalinsPituitary NeoplasmsReceptors, OpioidPituitary Gland, AnteriorAdrenocorticotropic HormonePituitary DiseasesPituitary HormonesPituitary ApoplexyPituitary Hormones, AnteriorPituitary Adenylate Cyclase-Activating PolypeptidePituitary Gland, PosteriorAdenomaProlactinPituitary Function TestsProlactinomaGonadotropins, Pituitary