tokens: These isoforms ( elf-2a and elf-2b ) contain identical RBTN-2 binding regions and DNA-binding domains .
folded_tokens: these isoforms ( elf-2a and elf-2b ) contain identical rbtn-2 binding regions and dna-binding domains .
labels: O O O B-protein_molecule O B-protein_molecule O O O B-protein_molecule O O O B-protein_domain_or_region I-protein_domain_or_region O