FTP, identify this smallest part of the cytoskeleton, made up of tubulin.
These structures can be destabilized using katanin or stathmin, and undergo a phenomenon known as dynamic instability in which they oscillate between growing and shrinking phases apparently at random.  Each of these structures originates from a namesake "organizing center", and MAP Kinase phosphorylates a group of proteins responsible for assembling and stabilizing these structures.  Both kinesin and dynein transport molecules along these structures, which appear in a 9+2 arrangement in flagella and cilia.  FTP, identify this smallest part of the cytoskeleton, made up of tubulin.
These structures can be destabilized using katanin or stathmin, and undergo a phenomenon known as dynamic instability in which they oscillate between growing and shrinking phases apparently at random.  
{microtubules}