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OCT3/4 is the full name of POU class 5 homeobox 1 (POU5F1) in the human genome. It is highly conserved in other species. It is an important transcription factor for embryonic stem cells and primordial germ cells to maintain the multi-directional differentiation potential. It is mainly expressed in embryonic stem cells and primordial reproduction. Therefore, its abnormal expression usually indicates germ cell tumorous lesions, and it can also be used in cell biology as one of the stemness identification markers of cancer stem cells.