Chen Chen W W Xu Xu Z Z Sullivan Sullivan A A Finkielstain Finkielstain GP GP Van Ryzin Van Ryzin C C Merke Merke DP DP Junction site analysis of chimeric CYP21A1P/CYP21A2 genes in 21-hydroxylase deficiency Junction site analysis of chimeric CYP21A1P/CYP21A2 genes in 21-hydroxylase deficiency Clin Chem Clin Chem 2012 2012 58 58 421 421 30 30 10.1373/clinchem.2011.174037 10.1373/clinchem.2011.174037 22156666 22156666. The gene discussed is CYP21A2; the disease is classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency.