1VES:
reference: Structural evidence for evolution of shark Ig new antigen receptor variable domain antibodies from a cell-surface receptor., Streltsov VA, Varghese JN, Carmichael JA, Irving RA, Hudson PJ, Nuttall SD, Proc Natl Acad Sci U S A 2004 Aug 24;101(34):12444-9. Epub 2004 Aug 10. PMID: 15304650

This OCA Structure page
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