with a ‘fir tree’ appearance of spindle fibres.
The establishment of a bipolar spindle symetry requires opposite forces, pushing poles apart through plus end-directed motors and focusing the poles through minus end-directed motors. In addition to minus end MT motors belonging to the kinesin–14 family that act in prophase and are involved in early MT reorganization, the A. thaliana kinesin-related protein 125c (AtKRP125c) belonging to the plus end kinesin–5 group plays a role in establishing