微管组装的非稳态动力学模型 tubulin molecule with bound GTP GTP tubulin molecules 00 protofilaments containing GDP add to end of microtubule tubulin are unstable and peel away from the microtubule wall addition proceeds faster GDP tubulin is released than GTP hydrolysis to the cytosol tubulin molecule 00 with bound GDP GTP cap GROWING MICROTUBULE SHRINKING MICROTUBULE 313 微管组装的非稳态动力学模型