Better translation:
The thing that contained karin's dna and was tested.水月 : これって香燐が生まれた時のだと思ってたけど
Suigetsu : Well ... I think this comes from when Karin was born.
10/10 Karin for motherJapanese hospitals typically place part of the umbilical cord that falls off in a traditional box specifically designed for this purpose. When the mother leaves the hospital, the umbilical cord is given to her. This Japanese custom is based upon the belief that the umbilical cord has a direct relationship to the health of the baby. Maltreating it, therefore, risks causing harm or disease in the child. In some Japanese households, a mother may show a child the umbilical cord on certain events like birthdays to recall the day the child was born. In other households, the umbilical cord is given to a child on the day he or she leaves home or gets married to symbolize separation. Also, a preserved umbilical cord is considered to be a cure for the child when he or she is sick. Parents would cut a small portion of the cord and feed it to the child. Additionally, the Japanese believe that the umbilical cord is a symbol of the child’s fate. So if one loses his or her umbilical cord, his/her spiritual fate is considered lost as well.