- Pulsatile secretory characteristics of allopregnanolone, a neuroactive steroid, during the menstrual cycle and in amenorrheic subjects. Genazzani, A.D., Luisi, M., Malavasi, B., Strucchi, C., Luisi, S., Casarosa, E., Bernardi, F., Genazzani, A.R., Petraglia, F. Eur. J. Endocrinol. (2002)