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What is the X in X-mas?

fragile x-chromosome

fragile x-chromosome in Medicine

fragile X-chromosome n.
An X-chromosome with a fragile site near the end of the long arm, resulting in the appearance of an almost detached fragment.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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