Fig. 1.

MxiH needle protofilament nomenclature assignments used in this study. 2D representation of the needle filament, with protofilaments labeled from P1-P11, with P1 corresponding to the lowest protofilament in the helical arrangement. Subunits boxed in bold line are at an identical location in the needle helix. Note that TC subunits will later be labelled from α → ε according to their proposed order of insertion (with α being the lowest and hence probably the first subunit inserted).