At first glance, they seem to be some kind of exotic aquatic life photographed against a background of seaweed. But the spherical creatures portrayed in the pictures taken by scientists from Manhattan's Memorial Sloan-Kettering Cancer Center and Rockefeller University swim not in the sea but in the human bloodstream. They are lymphocytes, cells that are essential parts of the immune system and protect the body against invasion by germs and other foreign matter. Magnified about 13,000 times by a scanning electron microscope, they reveal for the first time structural differences between the two...
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