“…It is possible that other compounds were formed which were not detected by the isolation procedures used. Thus etienic or etianic acids formed by removal of the C07 side chain, as stated by Picha, Saunders & Green (1952) to occur in rat liver, would have been removed during the preparation of the neutral lipid extract. Compounds not possessing the oa-ketol side chain or the oc unsaturated oxo group, such as 20:21dihydroxypregnan-3-ones, would not have been detected unless present in large amounts.…”