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3D structure of syncytin-1 and syncytin-2 fusion subunits. Crystal structures were downloaded from RCSB Protein Data Bank (PDB) (Berman, 2000) at www.rcsb.org and are registered with the following identifiers: 5HA6 (syncytin-1, DOI: 10.2210/pdb5ha6/pdb) and 1Y4M (syncytin-2, DOI: 10.2210/pdb1y4m/pdb).
