Correction: Endogenous tetrahydrobiopterin in humans: circadian rhythm, sex, race, age, and disease status
Lan Gao, Neil Smith, Ronald Kong

Abstract
Genes, proteins, chemicals, diseases, species, mutations and cell lines named across the full text — each resolved to its canonical identifier and authoritative record.
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Taxonomy
TopicsMetabolism and Genetic Disorders · Nitric Oxide and Endothelin Effects · Amino Acid Enzymes and Metabolism
E_max_ was erroneously written as E_max*Age_.
A correction has been made to the section Results, Endogenous BH4 concentrations in participants with PBD and PKU, Participants with PKU, Paragraph Number 3:
“The E_max_ and AM50 values were 12.69 ng/mL and 2.70 years, respectively. There was essentially no change in central trend of endogenous BH4 concentration in participants with PKU aged >2 years. This was confirmed with the Pearson correlation analysis for data in the group aged >2 years, which yielded a correlation coefficient (R) of 0.2265 and a p-value of 0.1656 (Supplementary Figure S1).”
The original article has been updated.
