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Comparative phylogenetic analysis of the ScaD-borne SLH module. The A. cellulolyticus SLH modules (filled symbols) map on a separate branch of the phylogenetic tree, together with those of the anchoring proteins of C. thermocellum (OlpA, OlpB, and Orf2p) and B. cellulosolvens ScaB. See Table 3 for sources of sequences used to prepare this figure. Symbols: squares, anchoring proteins; circles, surface-bound enzymes; triangles, surface layer proteins.
