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Levels of endogenous disaccharide biomarker UA-HNAc(1S) PMP derivative in newborn DBS from 30 random newborns (non-MPS-I), from 13 newborns with severe MPS-I, and from 2 newborns with attenuated MPS-I. Asterisked dots are from newborn DBS that were stored at ambient temperature, all others were stored frozen.
