tokens: However , only that located at the 3' end appeared to be utilized in the 2 . 3-kb cDNA .
folded_tokens: however , only that located at the 3' end appeared to be utilized in the 2 . 3-kb cdna .
labels: O O O O O O O O O O O O O O O B-DNA_molecule I-DNA_molecule I-DNA_molecule I-DNA_molecule O