Huang – who suffers from PKU - seems to be pleased after successfully inserting a straw into a small bottle, in this photo taken on April 19. 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]
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