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The B. thuringiensis ssp. pakistani nrdF intron encodes a GIY-YIG-like homing endonuclease. Alignments made with Expresso (3DCoffee) showing I-BthII GIY-YIG domain aligned with I-BanI, I-BmoI and I-TevI. Light and dark grey boxes below the aligned sequences show β-strands and α-helices of I-TevI catalytic domain based on the 3D structure of the N-terminal domain (24).
