title: FDA withholds xeno data.
authors.forename: J L
authors.initials: JL
authors.lastname: Fox
mesh_terms: D000818:Animals; D019992:Databases as Topic; D006801:Humans; D012106:Research / Q000592:standards*; D014183:Transplantation, Heterologous / Q000592:standards*; D014481:United States; D014486:United States Food and Drug Administration