. . "20th chromosome" . . . . "chromosomes, human, pair 19" . . . . "20" . "Chromosome 19, trisomy 19q" . . "Chromosome 20" . "Chromosome 22, trisomy" . . . . . "chromosome 20q12-q13" . "chromosome 20q11.2" . "chromosome 20" . . . "Chromosome 20" . . "20q13.32" . "20p13" . "chromosomes, human, pair 21" .