Abstract
Use of the culture techniques for postimplantation rodent embryos, modified by explanting Day 9 or Day 10 embryos with the trophoblast cells removed but the remainder of the parietal yolk sac left intact, resulted in significant expansion of Reichert's membrane, accompanied by a marked increase in the numbers of the adherent parietal endoderm cells which synthesize the membrane. The surface area of the parietal endoderm/Reichert's membrane complex roughly doubled during culture, and the combined protein content of the cells and their basement membrane was also raised after incubation. Parietal endoderm cell numbers, calculated from area and cell density measurements on flattened membranes, increased by 54-190%, depending on the age of the embryo.
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