More precisely, scientists concluded that the human Y chromosome is present not just in the reproductive tract but the Y-linked genes are active all-over the body, and they may be contributing to the differences in disease severity and susceptibility found between women and men. In other words, if all the cells of the human body are possible to be XX or XY marked, the new findings could bring an end to “unisex” treatment of diseases, allowing sexes to receive different therapies or medicines. This is the beginning of a new era in Y chromosome biology, appreciated the Whitehead Institute’s Director David Page. The research was developed for more than one decade and will be continued for many years to come. “There are approximately a dozen genes conserved on the Y chromosome that are expressed in cells and tissue types throughout the body,” Page said. Defining and studying them is the science’s duty because their existence can no longer be ignored in the interest of human existence.