Specific activities were determined for cortisol and its metabolites isolated from several successive urine samples collected from patients who had each received a single injection of a tracer dose of [4-14C]cortisol. Some theoretical aspects of the curves relating specific activity to time after injection are considered.
Evidence is presented and discussed for an alternative route to the 11-oxygenated 17-oxosteroid metabolites of cortisol probably involving not an initial reduction of the ring A of cortisol but a simultaneous cleavage of the side-chain at C-17 of the steroid nucleus and reduction of ring A.
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