Rhizozygotic twins beat the frozen odds
Scientific American, 14 June 2007 Emmett and Otto Ramstad present a fascinating glimpse into the diversity of biology. They are rhizozygotic twins. Rhizozygotic twins are an extremely rare form of multiple birth, enabled by the wonders of assisted reproductive technology. On September 20 1975, an egg, or blastocyst, was harvested from the Ramstad twins’ mother Josie Winship and cryogenically frozen. Four years later, in January 1979, Ms. Winship decided to have the frozen egg thawed to try for pregnancy.