tokens: Interstitial deletion constitutes the major mechanism for loss of heterozygosity on chromosome 20q in polycythemia vera .
folded_tokens: interstitial deletion constitutes the major mechanism for loss of heterozygosity on chromosome 20q in polycythemia vera .
labels: O O O O O O O O O O O B-DNA_molecule I-DNA_molecule O B-other_name I-other_name O