tokens: The helix-loop-helix ( HLH ) proteins are a family of transcription factors that include proteins critical to differentiation and development in species ranging from plants to mammals .
folded_tokens: the helix-loop-helix ( hlh ) proteins are a family of transcription factors that include proteins critical to differentiation and development in species ranging from plants to mammals .
labels: O B-protein_substructure O O O O O O O O B-protein_family_or_group I-protein_family_or_group O O O O O O O O O O O O B-multi_cell O B-multi_cell O