- Naturally occurring mutants of human steroid 21-hydroxylase (P450c21) pinpoint residues important for enzyme activity and stability. Nikoshkov, A., Lajic, S., Vlamis-Gardikas, A., Tranebjaerg, L., Holst, M., Wedell, A., Luthman, H. J. Biol. Chem. (1998)









