tokens: An acquired deletion of the long arm of chromosome 20 is a recurrent abnormality in myeloproliferative disorders , particularly polycythemia vera and myelodysplastic syndromes .
folded_tokens: an acquired deletion of the long arm of chromosome 20 is a recurrent abnormality in myeloproliferative disorders , particularly polycythemia vera and myelodysplastic syndromes .
labels: O O O O O B-DNA_substructure I-DNA_substructure O B-DNA_molecule I-DNA_molecule O O O O O B-other_name I-other_name O O B-other_name I-other_name O B-other_name I-other_name O