1MUA:
reference: Structure and energetics of a non-proline cis-peptidyl linkage in a proline-202-->alanine carbonic anhydrase II variant., Tweedy NB, Nair SK, Paterno SA, Fierke CA, Christianson DW, Biochemistry 1993 Oct 19;32(41):10944-9. PMID: 8218160

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