However , B4-2 has an unusually high proline content ( 13% ) , contains a putative nuclear targeting sequence , and has several SPXX motifs which are frequently found in gene regulatory proteins .
however , b4-2 has an unusually high proline content ( 13% ) , contains a putative nuclear targeting sequence , and has several spxx motifs which are frequently found in gene regulatory proteins .
O O B-DNA_molecule O O O O B-amino_acid_monomer O O O O O O O O B-protein_domain_or_region I-protein_domain_or_region I-protein_domain_or_region O O O O B-protein_substructure I-protein_substructure O O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O