Article: Hair - the long and the short of it. (fibroblast growth factor 5 linked to hair growth in mice) (Brief Article)

When Rapunzel let down her hair for the prince to climb up, she had no clue that a genetic defect probably lay at the root of her golden locks. But then, neither did anyone else until an experiment in developmental biology went awry.

Researchers studying a chemical messenger called fibroblast growth factor 5 had created mice that lacked the gene for this messenger to see how its loss would affect embryonic development. To their surprise, the newborn mice looked and acted normal, says Gail L. Martin, a developmental biologist at the University of California, San Francisco. But a few weeks later, she and her colleagues noticed that the mice with the missing growth ...

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