So we have this X chromosome number one, and it's identical cystochromatid and X chromosome number two, and it's identical replicated cystochromatid. So we have a pair of these cystochromatids. So we have interface taking place and then meiosis begin. So let's fast forward to metaphase one of meiosis. So this is when our tetrimers basically line up at the equatorial plate of the cell. And also what happens is the mitotic spindle apparatus forms and these spindle fibers permeate extend from these centrioles, and they are supposed to attach, at least in a normal case, to these cystochromatid pairs.