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Germ cells are the only cell type that passes genetic information to the next generation.In most metazoan species, primordial germ cells (PGCs) were induced from epiblasts by signals from the neighboring tissues.In vitro derivation of germ cells from the pluripotent stem cells (PSCs) such as embryonic stem cells (ESCs) and induced PSCs (iPSCs) are of great values for the treatment of infertility, for animal breeding, and for studying the mechanism of germ cell development.