<n0:ComplexDefinition xmlns:n0="http://ncicb.nci.nih.gov/xml/owl/EVS/ComplexProperties.xsd#"><n0:def-definition>Any of a class of anti-mitotic compounds that bind to the taxane site of the beta-tubulin subunit, a region described as a binding pocket located within the middle domain and corresponding to an approximate residue sequence of 217-231. Specifically, these agents bind to a cysteine residue within the pocket, which is also the binding site for GTP. Agents binding at the taxane site promote the polymerization of dimers to form a very rigid and stable microtubule structure which is not readily disassembled. By interfering with microtubule dynamics these agents inhibit the normal turnover process essential during mitosis, thereby causing cell-cycle arrest and/or apoptosis.</n0:def-definition><n0:def-source>NCI</n0:def-source></n0:ComplexDefinition>