Scanning Electron Microscopic Study on Human Primordial Germ Cells during the Migration Period
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The surface topography of human primordial germ cells (PGCs) during the migration period was observed by scanning electron microscopy, paying special attention to the association of PGCs with somatic cells. PGCs in the stationary phase of their migration were spherical in shape and measured 12μm in diameter. The cell surface was generally smooth with some microvilli. On the other hand, PGCs in tne moving phase revealed an indefinite shape and often possessed pseudopodia. Their surface was scmewhat undulating and microvili were rarely found. PGCs were often seen to make contact with neighboring mesenchymal cells during their migratory course, especially at the root of the dorsal mesentery or other areas near the gonads. Two types of contact were observed: direct adhesion of a mesenchymal cell body to a PGC, and indirect adhesion by cytoplasmic protrusions from a mesenchymal cell to a PGC. In the latter case, three types of protrusions, i. e. lobopodia, filopodia, and lamellipodia, were observed. These contacts between PGCs and somatic cells may be related to the mechanisms of migration of PGCs.
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