Corticosterone (B) and 18-hydroxy-11-deoxycorticosterone (18OHDOC) but
not 11-deoxycorticosterone (DOC) displaced cortisol (F) specifically
bound to rat adrenal mitochondria. F competitively inhibited aldostero
ne formation from B, 18OHB and 18OHDOC but did not inhibit conversions
of DOC to B or 18OHDOC. High concentrations of DOC increased its conv
ersion to 18OHDOC rather than B.