Eventually this bulging part is broken up into a series of small portions, each of which contains one germ cell or ovum, and gives rise to a Graafian follicle.
He is also studying how germ cell determining mechanisms evolved in vertebrate embryos.
At that time, germ cell tumors were the cause of death in 400 males per year in germ cell tumors were the cause of death in 400 males per year in Germany.
Early in development of the fetal germ cells in both sexes, the germ-cell genomes are erased of methylation marks on the imprinted genes.
The reverse is not true, and a compound may well be a somatic cell mutagen but not a germ cell mutagen.