Fig. 1

Ultrastructure of the T. brucei basal body. a Longitudinal TEM section through the entire basal body; b1–9 TEM cross sections through the mature basal body from the proximal end (b1) to the distal end (b9). See text for explanation. c Basal body nomenclature during basal body duplication. Mature basal body (MBB) called BB1, Newly mature basal body (NMBB) called BB2 and was formerly the pro-basal body, new pro-basal body (PBB) BB3 assembles close to BB1, new pro-basal body (PBB) BB4 assembles close to BB2; d transverse cross section from a tomogram illustrating the acorn structure in the lumen of the transition zone. Transitional fibres marked with arrows and microtubule doublets are numbered; e cartoon representation of a cross section through the transition zone showing the luminal acorn structure. Images were produced from work in the labs of SV and KG. The cells were detergent-extracted cytoskeletons, prepared as per method in [41]. Scale bars 100 nm