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fragile site in Medicine

fragile site

(frăjəl)
n.
  1. A nonstaining gap at a specific point on a chromosome that usually involves both chromatids and always appears at exactly the same point on chromosomes of different cells from an individual or kindred.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.