4NSM:
reference: The crystal structure of the streptococcal collagen-like protein 2 globular domain from invasive M3-type group A Streptococcus shows significant similarity to immunomodulatory HIV protein gp41., Squeglia F, Bachert B, De Simone A, Lukomski S, Berisio R, J Biol Chem. 2013 Dec 19. PMID: 24356966

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