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This just means penetration is slow and most of the action is happening on the surface
PncA, a nicotinamidase that converts nicotinamide (niacin) to nicotinic acid, is needed to provide a precursor for biosynthesis of NAD (Purser et al., 2003)
[DOI] [PubMed] [Google Scholar] 3.Akinyemi M.O., Braun D., Windisch P., Warth B., Ezekiel C.N
The Glutathione Status of Cells
