microtubule plus-end 2010-03-11T10:55:00Z GO:0035371 The growing (plus) end of a microtubule. In vitro, microtubules polymerize more quickly at the plus end than at the minus end. In vivo, microtubule growth occurs only at the plus end, and the plus end switches between periods of growth and shortening, a behavior known as dynamic instability. cellular_component bf microtubule plus end growing microtubule plus end microtubule end