nicotinamide; ethylenediaminetetraacetic acid; Δ5 3β-hydroxysteroid dehydrogenase of isolated Leydig cells from Sprague-Dawley rats; medium 199-Hepes-bovine serum albumin; nicotinamide adenine dinucleotide; magnesium chloride T=34°C; 1 h; metabolism in dependence on age of rats (fetal day 19 to adult), <7-3H>-labeled study; Product distribution;
