It contains a basic helix-loop-helix ( bHLH ) motif contiguous with a Per-Arnt-Sim ( PAS ) homology region .
it contains a basic helix-loop-helix ( bhlh ) motif contiguous with a per-arnt-sim ( pas ) homology region .
O O O B-protein_substructure B-protein_substructure O B-protein_substructure O O O O O B-protein_domain_or_region I-protein_domain_or_region I-protein_domain_or_region I-protein_domain_or_region I-protein_domain_or_region I-protein_domain_or_region O