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. 2001 Jun 15;20(12):3210–3217. doi: 10.1093/emboj/20.12.3210

graphic file with name cde301f4.jpg

Fig. 4. Model for the assembly of the McrBC endonuclease complex. McrBL or McrBS assemble into heptameric rings in the presence of GTP or GDP. These rings can spontaneously dimerize into a tetradecamer. McrC binding stabilizes the tetradecameric form of the endonuclease.