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ULTRASTRUCTURAL CHANGES OF THE HAMSTER ENDOMETRIAL STROMAL CELL DURING THE LAST HALF OF PSEUDOPREGNANCY

Summary.: The ultrastructural changes of the endometrial stromal cells were quantified in twenty hamsters on Days 5, 6, 7 or 8 of pseudopregnancy. The mean percentage of cytoplasmic volume occupied by mitochondria, dense bodies, lysosomes and lipids each did not differ significantly during the 4 days (P>0·05). The quantity of rough endoplasmic reticulum was not significantly different on Days 5 and 6 (P>0·05), but significant increases occurred from Day 6 to Day 7 (P<0·001) and from Day 7 to Day 8 (P<0·001). The change in rough endoplasmic reticulum between Days 6 and 7 occurred during the stage of pseudopregnancy when the uterus influenced ovarian function.