the tubulin fraction contained trace enzymatic activities when compared with the starting microtubule protein , i.e. , less than 1 versus 60 mu/mg/min of nucleoside diphosphate kinase , 0.2 versus 7.0 nmol/mg/min of mg-atpase at ph 6.6 , and 0.2 versus 88 mu/mg/min of adenylate kinase .
C0041348
tubulin
C0026046
microtubule