4D Visualization of replication foci in mammalian cells corresponding to individual replicons by Chagin, V, Casas-Delucchi, C, Reinhart, MR, Schermelleh, L, Markaki, Y, Maiser, A, Bolius, J, Bensimon, AB, Filies, M, Domaing, P, Rozanov, Y, Leonhardt, H, Cardoso, M