..., is established post-implantation and/or is brain specific. The regulation of the imprinted domain comprising Ndn, Magel2, Mkrn3, and Peg12 deserves further study since the human orthologs of Ndn, Magel2, and Mkrn3 are in the region associated with Prader-Willi syndrome (Lee and Wevrick 2000), with patients...