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50 years ago in the Journal of Pediatrics: comparison of serum phenylalanine levels with growth in Guthrie's inhibition assay in newborn infants.

50 years ago in the Journal of Pediatrics: comparison of serum phenylalanine levels with growth in Guthrie's inhibition assay in newborn infants. J Pediatr. 2012 Sep; 161(3):530.

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