Word: amnion
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Both male & female babies slough off many different types of cells into the amnion ("bag of waters") in which they are carried. After the seventh month, a girl baby sloughs off distinctive cells like those from the genitalia of an adult woman. By puncturing the bag of waters late in pregnancy, draining off a little fluid, and staining the cells, the sex of 25 babies was foretold with accuracy at the University of Brussels' Laboratory for Experimental Gynecology...
...Sample test question: "There are four embryonic membranes in vertebrates-the yoke sac, the allantois, the amnion and the chlorion. The amnion and chlorion are formed by a fold of the somatopleure. . . . " Problem: to locate these on a diagram...