3DV4:
reference: Pseudo-symmetry and twinning in crystals of homologous antibody Fv fragments., Brooks CL, Blackler RJ, Gerstenbruch S, Kosma P, Muller-Loennies S, Brade H, Evans SV, Acta Crystallogr D Biol Crystallogr. 2008 Dec;64(Pt 12):1250-8. Epub 2008, Nov 18. PMID: 19018101

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