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X-chromosome

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X-chro·mo·some or X chromosome   (ěks'krō'mə-sōm')
n.  The sex chromosome associated with female characteristics in mammals, occurring paired in the female and single in the male.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

X-chromosome n.
The sex chromosome associated with female characteristics, occurring paired in the female and singly in the male sex-chromosome pair.

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