The DNA Transfer System has only been shown once in Missing Link and A Fine Mess. The program's function allows a Lyoko Warrior to transfer their personal DNA sequence codes to another warrior. This however is dangerous as after the process is complete, the user's memory is exposed and can be stolen by X.A.N.A. at will. This occurs because without a sequence code, a person can't convert their digital DNA back to human DNA so they become a part of Lyoko.