X

X inactivation X IN-ak-tah-VA-shun Turning off one X chromosome in each cell of a female mammal at a certain point in prenatal development. 293

X-inactivation center X IN-ak-tah-VA-shun SEN-ter The part of the X chromosome that inactivates the X. 293

xylem ZI-lem Plant vessels that transport dissolved ions and water. 496, 534

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