So the major difference between male individuals and female individuals is that in female individuals, all the primary oocytes are formed before that individual is actually born. They are formed during fetal development. So all these stem cells we call ogonia inside our developing fetus basically differentiate into the primary oocyte. And this happens before the birth of that female individual. So once that female individual is born, all these stem cells have become the primary oocytes. And these primary oocytes are frozen.