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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

3al4

Crystal structure of the swine-origin a (h1n1)-2009 influenza a virus hemagglutinin (ha) reveals similar antigenicity to that of the 1918 pandemic virus