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X (2)
x (1)
x (2)
x-axis
X-certificate
X chromosome
x-coordinate
x-height
X-inactivation
x out
X-radiation
X-rated
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X-ray astronomy
X-ray crystallography
X-ray diffraction
X-ray fluorescence
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X-inactivation
X-inactivation


noun 
Definition:
 
chromosome selection theory: the theory that in females one of the X chromosomes, randomly selected, becomes permanently inactive early in development
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