title: The conversion of progesterone to pregnenolone by Tetrahymena pyriformis.
mesh_terms: D002849:Chromatography, Gas; D013058:Mass Spectrometry; D011284:Pregnenolone / Q000302:isolation & purification / Q000378:metabolism*; D011374:Progesterone / Q000378:metabolism*; D013769:Tetrahymena pyriformis / Q000378:metabolism*
chemical_list: D011374:Progesterone; D011284:Pregnenolone