these microtubules show , in addition to the major alpha- and beta-tubulin components , major proteins with molecular weights of 201 000-206 000 ( comprising 4.5 % of the total protein ) , proteins with molecular weights of 97 000 , 100 000 , 104 000 , and 114 000 ( together comprising approximately 2 % of the total protein ) , and minor components with molecular weights of 68 000 and 151 000 .
C0026046
microtubules
C0005290
beta-tubulin