A two-way molecular dialogue between embryo and endosperm is required for seed development. - Doll, N. M.; Royek, S.; Fujita, S.; Okuda, S.; Chamot, S.; Stintzi, A.; Widiez, T.; Hothorn, M.; Schaller, A.; Geldner, N.; Ingram, G. (Science (pre-March 2025), 2020)