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FASTA Sequence PDB Format mmCIF Format
FASTA Sequence PDB Format PDB Format(gz) PDBx/mmCIF Format PDBx/mmCIF Format(gz) PDBML/XML Format Validation Full PDF Validation CIF

1mep

Crystal structure of streptavidin double mutant s45a/d128a with biotin: cooperative hydrogen-bond interactions in the streptavidin-biotin system.