According to a recent study used to develop this Gonocytes assignment, the abnormal high temperature of UD leads to an irregular apoptosis that let some gonocytes to remain arrested and transform in cancerous cells that leads to malignancy and infertility in adulthood via several mutations and cellular unbalance.
Before getting differentiated into spermatogonial stem cells within this cell profile report, these can be found from week 7 of the embryonic development till the neonatal stage.