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Ribbon diagram of the AbPncA monomer and location of the active site. Zn2+ is shown as a grey sphere, nicotinic acid as a stick model colored black for C, blue N and red O. Helices (cyan) are labelled and β-strands (blue) numbered. The terminal positions of the polypeptide are labelled N and C. B. Molecular images prepared with PyMol.[14]
