Adolescence begins with a kiss: scientists have found that a gene determines the secretion of human sex hormones, which determines when you begin, and they name this gene as "kiss one". Scientists have recently studied that the "kissing No. 1" gene produces a protein called Kisspeptin, which will suddenly activate in the brain at the beginning of the youth. Then it will send a signal to another important gene "GPR54" in the human body, telling the human body to start secretion of marking hormones. The birth of this genetic signal chain will help scientists to solve a mystery of long-term biodiversity: why people have a complete secretion or even hormones when they are born, but these features have been in a "hibernation" state in children. Adolescence awakening? Studies have shown that the "Kiss No. 1" gene is like a timing switch, and it will activate the secretion of human hormones at a certain time. But it is impossible to act separately: researchers believe that other genes also play an important role in this process. According to these results, scientists may find new treatments to prevent adolescence or too late.