the porphyrin-inducing steroids , 3 alpha-hydroxy-5 alpha-pregnane-11,20-dione ( alfaxalone ) and 3 alpha-hydroxy-5 alpha-pregnan-20-one induce considerably greater fluidity changes in spin-labelled phospholipid-cholesterol bilayers than do the corresponding 3 beta-hydroxy steroids which are also less potent as porphyrin inducers .
C0033006
pregnane
C0038317
steroids