Cabrera-Sharp, V., Read, J. E., Richardson, S., Kowalski, A. A., Antczak, D. F., Cartwright, J. E., …De Mestre, A. M. (2014). SMAD1/5 signaling in the early equine placenta regulates trophoblast differentiation and chorionic gonadotropin secretion. Endocrinology, 155(8), 3054-64. https://doi.org/10.1210/en.2013-2116