There has also been research into the way that telomeres and sarcomeres impact MD. Telomeres are caps at the end of all DNA strands that protect them. The job of telomeres is vital to the health of the body because every cell in the bodies contain them. The cells in the body replenish themselves by creating copies, this happens more when people are young, and slows down as they get older. This happens because the longer that cells replenish themselves, the shorter the telomeres become and eventually they become too short to continue working well. This is when cell aging will begin and their functionality begins to fail. Telomeres also help with organizing the chromosomes in the nucleus of the cell and allow the cells to be replicated properly.