4HE6:
reference: Ultratight crystal packing of a 10 kDa protein., Trillo-Muyo S, Jasilionis A, Domagalski MJ, Chruszcz M, Minor W, Kuisiene N, Arolas JL, Sola M, Gomis-Ruth FX, Acta Crystallogr D Biol Crystallogr. 2013 Mar;69(Pt 3):464-70. doi:, 10.1107/S0907444912050135. Epub 2013 Feb 16. PMID: 23519421

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