Crystal structure of undecaprenyl-pyrophosphate phosphatase and its role in peptidoglycan biosynthesis por El Ghachi, M, Howe, N, Huang, C, Olieric, V, Warshamanage, R, Touzé, T, Weichert, D, Stansfeld, P, Wang, M, Kerff, F, Caffrey, M