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Fig. 2 | BMC Evolutionary Biology

Fig. 2

From: Surface layer proteins from virulent Clostridium difficile ribotypes exhibit signatures of positive selection with consequences for innate immune response

Fig. 2

Structural model of slpA LMW sub-unit with positively selected sites highlighted. 3D model of the LMW SLP obtained from PDB (3cvz). α-helices and β-sheets can clearly be seen along with loop regions. Specific amino acids under positive selection are labelled in gold. The majority of sites under positive selection can be seen in Domain 2, which is rich in loops. A red asterisk indicates a residue with a probability of greater than 0.9

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