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A ribbon rendering of a monomer of APE1/Ref-1 with key cysteine residues necessary for redox activity shown in red (C65, C93 and C99) and additional cysteine residues not necessary for redox activity shown in purple (C138, C208, C296 and C310). Two beta strands contain C65 and C93 and the connecting loop region contains C99. Structure: 4QHD, rendered with Mol* [24,25].
