Figure 1.

Image data for Bor1p tubular crystals. (A) Image of a Type 1 tubular crystal. (B) Incoherent sum of Fourier transforms from overlapping segments along many Type 1 tubular crystals revealing a characteristic pattern of layer lines. (C) Fourier transform from an individual tubular crystal. Numbers at the periphery (h,k; n) correspond to a Miller index (h,k) and the Bessel order (n) that together reflect the symmetry for this particular helical family. (D) Image of a Type 2 tubular crystal. (E) Incoherent sum of Fourier transforms and (F) Fourier transform from an individual tube with the helical indexing that characterizes Type 2 tubes. Note that the Bessel orders from Type 1 tubes are different from Type 2 tubes. Specifically, the (0,1) layer line has Bessel orders of 9 and 8, respectively.