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. 2020 Mar 16;12(3):780. doi: 10.3390/nu12030780

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(A) Vitamin K (K₁, or phylloquinone and menaquinone (MK)) content in the liver tissue in adults (closed circles) and neonates (open circles) without definite liver dysfunction. (B) Menaquinone-4 2, 3-epoxide/menaquinone-4 (Epo./MK-4) ratio after vitamin K (MK-4) loading in normal adults and 1-month-old infants.