Y. Ma, Y. Yue, Y. Ma, Q. Zhang, Q. Zhou, Y. Song, Y. Shen, X. Li, X. Ma, C. Li, M.A. Hanson, G.W. Han, E.A. Sickmier, G. Swaminath, S. Zhao, R.C. Stevens, L.A. Hu, W. Zhong, M. Zhang, F. Xu “Structural basis for apelin control of the human apelin receptor” Structure 25, 858-866 (2017).
https://www.sciencedirect.com/science/article/pii/S0969212617301260