Expression of functional prolactin receptors in nonpregnant human endometrium: janus kinase-2, signal transducer and activator of transcription-1 (STAT1), and STAT5 proteins are phosphorylated after stimulation with prolactin. - Jabbour,H.N.; Critchley,H.O.; Boddy,S.C. (J Clin Endocrinol Metab, 1998)