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The blood of a two-week-old baby being collected for a phenylketonuria (PKU) screening. The screening test was invented in 1960 by microbiologist Dr Robert Guthrie.
Photo by US Air Force/Staff Sgt Eric T Sheler.

The blood of a two-week-old baby being collected for a phenylketonuria (PKU) screening. The screening test was invented in 1960 by microbiologist Dr Robert Guthrie. Photo by US Air Force/Staff Sgt Eric T Sheler.


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