1UG4:
reference: Structural difference between group I and group II cobra cardiotoxins: X-ray, NMR, and CD analysis of the effect of cis-proline conformation on three-fingered toxins., Chen TS, Chung FY, Tjong SC, Goh KS, Huang WN, Chien KY, Wu PL, Lin HC, Chen CJ, Wu WG, Biochemistry 2005 May 24;44(20):7414-26. PMID: 15895985

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