FIGURE 4: Schematic of S. cerevisiae telomeres in wild-type telomerase-positive cells (top), type I survivors (middle), and type II survivors (bottom). All wild-type telomeres contain an X element, and approximately half to two-thirds also contain one to four Y’ elements. In type I survivors, Y’ elements are amplified, even in telomeres that did not originally have a Y’ element. The terminal telomeric repeats are amplified in type II survivors.