Nuclear medicine begins with a boa constrictor.
D000818:Animals; D004739:England; D005243:Feces / Q000032:analysis; D005602:France; D005858:Germany; D049672:History, 19th Century; D049673:History, 20th Century; D009683:Nuclear Medicine / Q000266:history*; D009686:Nuclear Physics / Q000266:history*; D011868:Radioisotopes; D012911:Snakes; D012955:Societies, Medical / Q000266:history; D014481:United States; D014508:Urea / Q000032:analysis
D011868:Radioisotopes; D014508:Urea