Acts as a translational repressor. Can mediate repression affecting different steps in the translation process: cap-driven, IRES-driven, polyadenylated RNAs or nonpolyadenylated RNAs (By similarity). Essential for the development of primordial germ cells (PGCs) by ensuring their proper migration and survival. 3'-UTR is sufficient for directing specific expression of this protein in the primordial germ cells (PGCs). Present in oocytes and in embryos before the 4- and 256-cell stages. Levels decline and it is barely detectable by the fifth day of development. The Nanos-type zinc finger is composed of two C2HC motifs, each motif binding one molecule of zinc. It is essential for the translation repression activity of the protein. Belongs to the nanos family.