Table 3. Diameter changes in wild-type and fcpA^–/fcpB^– mutants reflect differences in sheath composition.

Leptospira strain	Inner Curvature*	Outer Curvature†	Both‡	Total # Images
WT	0	4	7	162
fcpB–	0	4	2	139
fcpA–	16	3	1	83

* ‘Inner curvature’ refers to filaments where an abrupt transition in the apparent filament diameter was observed on the concave side of a curved filament.

† ‘Outer curvature’ refers to filaments where an abrupt transition was observed on the convex side.

‡ ‘Both’ refers to cases where both ‘inner’ and ‘outer’ transitions were observed in the same filament (see Figure 5—figure supplement 1).