steroid 21 monooxygenase Humans 16 Steroid 21-Hydroxylase 16 human 16 Adrenal Hyperplasia, Congenital 14 article 14 congenital adrenal hyperplasia 14 CYP21A2 protein, human 10 Mutation 10 genetics 10 allele 8 chemistry 8 controlled study 8 gene mutation 8 genotype 8 mutation 8 point mutation 8 Alleles 6 Argentina 6 Genotype 6 Male 6 Models, Molecular 6 Point Mutation 6 Protein Stability 6 corticotropin 6 enzyme activity 6 exon 6 hydroxyprogesterone 6 male 6 phenotype 6