we have examined the effects of dilution , ca2+ , reduced temperature , and triphosphate depletion on microtubules formed from purified tubulin , heat-treated microtubule-associated proteins ( maps ) , and either gtp , 2',3'-dideoxyguanosine 5'-diphosphate ( ddgdp ) , or 2',3'-dideoxyguanosine 5'-triphosphate ( ddgtp ) .
C0026046
microtubules
C0026045
microtubule-associated proteins