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Holm, L., C. Ouzounis, C. Sander, G. Tuparev, and G. Vriend. A Database of Protein Structure Families With Common Folding Motifs. Cold Spring Harbor Laboratory Press, 1992.

Holm, L., et al. A Database of Protein Structure Families With Common Folding Motifs. Cold Spring Harbor Laboratory Press, 1992.