Epigenetic modifications in an imprinting cluster are controlled by a hierarchy of DMRs suggesting long-range chromatin interactions
Lopes, S.; Lewis, A.; Hajkova, R.; Dean, W.; Oswald, J.; Forne, T.; Murrell, A.; Constancia, M.; Bartolomei, M.; Walter, J.; Reik, W.
Human Molecular Genetics 2003 / vol 12 / pages 295-305