You assemble dam1 rings around a stabilized microtubule in vitro. you follow the properties of one specific microtubule that has 6 dam1 rings on it. you now change the buffer condition such that your microtubule begins to depolymerize. you look at the microtubule when it has shrunk to half its length. how many dam1 rings do you expect to see on the microtubule when it has shrunk to half its length?