Source:http://linkedlifedata.com/resource/umls/id/C1156021
GO: The 'de novo' formation of a microtubule, in which tubulin heterodimers form metastable oligomeric aggregates, some of which go on to support formation of a complete microtubule. Microtubule nucleation usually occurs from a specific site within a cell. [ISBN:0815316194]