Cytology: A Close Look at Heredity

One of the pictures looks like a Scottish meadow sprinkled with sleeping sheep. In another, more enlarged, the curious objects that looked at first like sheep actually seemed to resemble four tufts of cotton joined at a central point.

The photographs, which were published in a recent issue of Nature, are actually the most revealing and undistorted views man has ever had of the surface structure of heredity-bearing human chromosomes.

The chromosome closeups were made by German scientists at the University of Münster, using the recently developed scanning electron microscope. Unlike the conventional electron microscope, which forms an image...

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