Franchi, " Sull' eta mesozoica della zona delle pietri verdi nelle Alpi Occidentali," Boll.
Conn's syndrome is also very rare, caused by a benign adenoma or hyperplasia of the zona glomerulosa producing excess aldosterone.
The zona granulosa cells begin to secrete progesterone (granulosa lutein cells ).
The egg is surrounded by a special coat called the zona pellucida.
For fertilization to occur, a sperm must penetrate the tough outer membrane of the egg called the zona pellucida.