empty pericarp4 encodes a mitochondrion-targeted pentatricopeptide repeat protein necessary for seed development and plant growth in maize. by Gutiérrez-Marcos, J, Dal Prà, M, Giulini, A, Costa, L, Gavazzi, G, Cordelier, S, Sellam, O, Tatout, C, Paul, W, Perez, P, Dickinson, H, Consonni, G