tokens: PCR fragments were cloned , sequenced , clustered into homologous groups , and the group sequences searched on the GenBank database .
folded_tokens: pcr fragments were cloned , sequenced , clustered into homologous groups , and the group sequences searched on the genbank database .
labels: B-DNA_molecule I-DNA_molecule O O O O O O O O O O O O B-other_name I-other_name O O O B-other_name I-other_name O