West, R.C., Ming, H., Logsdon, D.M., Sun, J., Rajput, S.K., Kile, R.A., Schoolcraft, W.B., Roberts, R.M., Krisher, R.L., Jiang, Z., et al. (2019). Dynamics of trophoblast differentiation in peri-implantation–stage human embryos. Proc. Natl. Acad. Sci. U. S. A. 116, 22635–22644.