Yamaleyeva LM, Chappell MC, Brosnihan KB, Anton L, Caudell DL, Shi S, McGee C, Pirro N, Gallagher PE, Taylor RN, Merrill DC, Mertz HL. Downregulation of apelin in the human placental chorionic villi from preeclamptic pregnancies. Am J Physiol Endocrinol Metab. 2015 Nov 15; 309(10):E852-60.