So recall, in the process of interphase, we actually replicate every single DNA molecule in the cell. So if we're talking about a human cell, during the process of the cell cycle, we have 46 individual DNA molecules. And each one of these 46 DNA molecules is replicated. And we join them by using our proteins in the region known as the centromere. So in this diagram, we only have four of these pairs, but for humans, we have 46 of these chromosome pairs. And each one of these individual chromosomes in the pair is also known as a chromatid, or a sister chromatid.