Figure 3
From: Short-term sequence evolution and vertical inheritance of the Naegleria twin-ribozyme group I intron
Alignment of Naegleria homing endonuclease sequences. Identical residues compared to the N. jamiesoni T56E endonuclease sequence are shown by dots and deletions by dashes. Functional important residues involved in zinc binding and catalysis are indicated. Divergent regions within the N. martinezi NG872 sequence due to reading-frame shifts (*) are boxed. For structural comparisons to the I-Ppo I homing endonuclease, see [23].