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This undated microscope image made available by the National Center for Microscopy and Imaging Research shows HeLa cells. Until these cells came along, whenever human cells were put in a lab dish, they would die immediately or reproduce only a few times. Henrietta Lacks' cells, by contrast, grew indefinitely. They were "perpetual, everlasting, death-defying, or whatever other word you want to use to describe immortal," says Dr. Francis Collins, director of the U.S. National Institutes of Health. (National Center for Microscopy and Imaging Research via AP)

This undated microscope image made available by the National Center for Microscopy and Imaging Research shows HeLa cells. Until these cells came along, whenever human cells were put in a lab dish, they would die immediately or reproduce only a few times. Henrietta Lacks' cells, by contrast, grew indefinitely. They were "perpetual, everlasting, death-defying, or whatever other word you want to use to describe immortal," says Dr. Francis Collins, director of the U.S. National Institutes of Health. (National Center for Microscopy and Imaging Research via AP)

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