1ZPX:
reference: The Two Cysteine-rich Head Domains of Minicollagen from Hydra Nematocysts Differ in their Cystine Framework and Overall Fold Despite an Identical Cysteine Sequence Pattern., Milbradt AG, Boulegue C, Moroder L, Renner C, J Mol Biol 2005 Oct 14;. PMID: 16257007

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