Figure 4.

Group I intron location along the protein sequence (panel A) and in the structure of the DNA polymerase I (panel B). Panel A shows conservation profile of DNA polymerase I (see figure one for details). Panel B shows the structure of the DNA polymerase I (Klenow Fragment) from Escherichia coli (PDB ID: 1KLN[70]) colored according to site conservation. The arrow indicates intron insertion site, of the intron found in homologous protein in Bacillus subtilis phage SPO1, which is between Asn675 and Leu676 (space-filled model).

Swithers et al. BMC Evolutionary Biology 2009 9:303   doi:10.1186/1471-2148-9-303
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