Steroid 11-beta-hydroxylase

Steroid 11β-hydroxylase is a steroid hydroxylase found in the zona fasciculata.

Function
It generates cortisol from 11-deoxycortisol and corticosterone from 11-deoxycorticosterone. Note the extra "–OH" added at the 11 position (near the center, on ring "C"):

Clinical significance
A mutation is associated with congenital adrenal hyperplasia due to 11β-hydroxylase deficiency.