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. 2013 Sep 6;8(9):e72114. doi: 10.1371/journal.pone.0072114

Figure 4. Structural comparison of the conserved ββα-metal fold and catalytic sites of Gme HNHE, Hpy99I, phage T4 endonuclease VII, periplasmic nuclease Vvn from Vibrio vulnificus, and endonuclease I from bacterium Vibrio salmonicida.

Figure 4

Some additional secondary structures (β sheets) were inserted in the ββα-Me fold in Vvn nuclease and endonuclease I.