The authors are at the Howard Hughes Medical Institute and the Departments of Internal Medicine and Cell and Developmental Biology, University of Michigan, Ann Arbor, Michigan, 48109-0934, USA. seanjm@umich.edu
Boundary cap cells of the dorsal root ganglia were thought to be limited to a structural role regulating migration into or out of the neural tube. Now a study in this issue reports that they are progenitors of small-diameter nociceptive neurons.
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