Embryo adoption plants a complex family tree

February 15, 2010

An estimated 500,000 frozen embryos are stored nationwide as the byproducts of advanced fertility treatments, commonly known as in vitro fertilization, or IVF. Although most who create the embryos will use all of them in an attempt to have a child, sometimes there are extras. Anna and Sarah were once two of them. (St. Louis Post-Dispatch)