Porphyrin Induction: Equivalent Effects of 5αH and 5βH Steroids in Chick Embryo Liver Cells

Abstract
The 5alphaH (A : B trans) and 5betaH (A : B cis) steroids are equipotent in inducing delta-aminolevulinic acid synthetase and porphyrin accumulation in chick embryo liver cells maintained in serum-free culture medium. Thus there is no specific steric requirement for porphyrin-inducing activity in steroids.