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Schematic representation of GTFs in general (A) and GTFA of L. reuteri strain 121 (B), showing the four different domains—(i) N-terminal signal sequence, (ii) variable region with five RDV repeats (light grey boxes), (iii) catalytic domain, and (iv) C-terminal (putative) glucan binding domain with four YG repeating units (dark grey boxes)—according to the definition of Giffard and Jacques (19) and seven less- conserved YG repeating units (light grey boxes).
