Abstract
In recent years, a large amount of data on gene expression at different stages of primordial germ cell (PGC) development has been acquired. The process of germ line segregation in various species is realized differently, i.e., as preformation or epigenesis. The review surveys the mechanisms of the initial lineage specification of mammalian and human germ cells. The data on PGC identification from their initial detection in the epiblast to gonadal anlagen where they migrate has been analyzed. Information on the PGC markers of the different development, the mechanisms of PGC migration towards genital ridges and the chemokines that direct migration are discussed.
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