Gallbladder 4 gallbladder 4 vesícula biliar 3 Animal 2 Bufanolides 2 Bufonidae 2 Carbon Isotopes 2 Cholesterol 2 Mevalonic Acid 2 Pregnenolone 2 Seasons 2 Venoms 2 animal 2 article 2 bile duct 2 biosynthesis 2 bufadienolide derivative 2 carbon 2 cholangiography 2 cholesterol 2 diagnosis 2 drug synthesis 2 gallbladder scintiscanning 2 in vitro study 2 metabolism 2 methodology 2 mevalonic acid 2 pregnenolone 2 pyridoxylideneglutamate tc 99m 2 radioisotope 2