Dimers of the molecular motor kinesin can 'walk' along microtubules. A flex
ible neck connects the head of one kinesin of the dimer to its partner. Whe
n one head is bound to a microtubule, and when this head's neck 'linker' be
comes fixed temporarily, pointing towards the next binding site on the micr
otubule, the partner head is prompted to move forwards.