And we join these two chromosomes by using special proteins at a region known as the centromere found in this center location. Now, once we actually replicate the individual chromosomes, these individual chromosomes are now known as chromatids. So at this point, the cell basically contains 46 original chromatids and 46 replicative chromatids to make a combined total of 92 chromatids. So at the end of S phase, our cell contains 92 chromatids in human cells. Now, once the S phase is completed, it goes on into the G Two phase. So the G Two phase is basically the phase of interface that makes sure that the cell is fully prepared for the process of mitosis, for the process of cell division.