firstly , the ages when malignant teratomas form in the ovary ( children ) and testis ( adult ) follow by a similar span of years the time of oogenesis ( fetus ) and spermatogenesis ( onset at puberty ) and , specifically , follow by less than a decade the periods of active mitosis and meiosis during which interconnection of germ cells by intercellular bridges occurs .
C0039597
testis
C0037864
spermatogenesis