Fig. 4. Labelling patterns of cortical microtubules in tobacco BY-2 cells. (A-E) Untransformed cell (A) and cells stably transformed with GFP-TUA6 (B), GFP-AtMAP70-1 (C) and GFP-AtMAP70-5 (D,E). One in four cells expressing GFP-AtMAP70-5 had additional poles of growth (E). (F,G) Root epidermal cells of GFP-AtMAP70-5-overexpressing Arabidopsis plant show punctate labelling (F); when displayed as a time-lapse projection these punctae can be seen to resolve as linear cortical microtubules (G). Bars, 10 µm.