Einav Zangauker, the mother of a hostage freed from Hamas captivity and brought to Israel, spoke with him via video call for the first time in two years.
Hamas agreed to release the hostages and to the idea of handing over governing Gaza to Palestinian technocrats, but did not give a clear response to many other elements.
US scientists testing the technique say it could help people overcome infertility and potentially allow same-sex couples to have a genetically related child.