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Montage of images that together provide evidence that the γ-tubulin ring complex (γTURC) forms a helical template for microtubule nucleation. These include: immunofluorescence images of microtubules (red) with ends labelled for γTURC components (green); electron micrographs of microtubules (cyan), minus-end labelled with gold particles (yellow) conjugated to antibodies against γTURC components (antibody 'shell' shown as red rings); and tomographic reconstruction of a purified Drosophila γTURC (light green). [Cover design: Majo Xeridat] [article, p. 352, 358 and 365; news and views, p.E93].