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Assembly and opening of the PCNA123 ring. (a) PCNA12 dimer and PCNA3 monomer approaching each other during ring assembly. (b) The ring of the PCNA123 trimer. (c) PCNA12 dimer with PCNA3 modeled in contact with PCNA2 with an angle of 120° as in the trimer. A gap (6–7 Å) remains in the ring-shaped molecule as the angle between PCNA1 and PCNA2 is 130° instead of 120°.
