A teen without memories

This photo taken on April 19 shows Huang – who suffers from PKU - kissing her father on the face. The family says that her closest bond is with her father. Babies born with PKU are missing an enzyme called phenylalanine hydroxylase, Without the enzyme, levels of phenylalanine and two other substances – which are harmful to the central nervous system and can cause brain damage – build up in the body. [Photo/CFP]