title: 400,000 embryos and counting.
mesh_terms: D015925:Cryopreservation / Q000706:statistics & numerical data*; D019924:Embryo Disposition / Q000706:statistics & numerical data; D033041:Embryo Research / Q000941:ethics; D004622:Embryo, Mammalian; D005307:Fertilization in Vitro; D006801:Humans; D013234:Stem Cells; D014481:United States