Figure 1.

Rev–tubulin rings and related complexes. Shown are Rev filaments (A), MTs (B), colchicine depolymerized tubulin (C), RTTs (D), RTTs forming at the ends of MTs (E), Rev 1–59–tubulin rings (F), and Dolastatin-10–tubulin rings (G). RTT double-bars are visible in D (arrows). The inset in E shows MTs depolymerizing at both ends. Bars: (A–G) 100 nm; (inset) 200 nm.