2BB2:
reference: X-ray analysis of beta B2-crystallin and evolution of oligomeric lens proteins., Bax B, Lapatto R, Nalini V, Driessen H, Lindley PF, Mahadevan D, Blundell TL, Slingsby C, Nature 1990 Oct 25;347(6295):776-80. PMID: 2234050

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