. "sex chromosome" . . . "Xq24" . . "chromosomes, human, x" . . . "X-" . "X-chromosomes" . . "x chromosome inactivation" . . "X (sex chromosome)" . "extra copies of the X chromosome" . . "Xq12" . "Xq27-q28" . . . "X-linked" . . . . "Xq21 locus" . . . . "Xp21" . . . "X-linked traits" . "Xp11.23" . . . "X chromosomal" . "Chr. X" . "Xp21.1" . . "X chromosome" . "X chromosome" . "Xp21.3" . "Xq28" . "X chromosome#Humans" . . . . "Xp22.33" . . "Xq21.1" . "X_chromosome#Research" . "Xp22.2" . . "chromosome X" . "X chromosome" . . . "X-chromosome" . "X sex chromosome" . "x chromosome" . "X" . "X\u2013chromosome." . "XX" .