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Although the peptide library was constructed from a single mRNA library, the cyclic scaffold ensured that the D-library (whose members contain a single D Y at the N-terminus and other elongating amino acids are L-form) and the L-library (comprising all L-amino acids with L Y at the N-terminus) covered different three-dimensional spaces
More efficient penetration has been shown through directly comparing GSH to a GSH monoethyl ester (GEE), showing that GEE significantly elevated intracellular GSH levels in mesencephalic cultures (Zeevalk et al., 2007)
Whereas the specific mechanism underlying these observations remains unclear, there is evidence that HDL exert favorable effects on pancreatic -cell function
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Yet, a randomized, double-blind, placebo-controlled trial in 215 men (35-55 years old) found that daily supplementation with B vitamins (at 3 to 13 times the current RDA, except for folic acid, which was included at a dose equivalent to the RDA), vitamin C (500 mg/day), zinc (10 mg/day), and magnesium (100 mg/day) for 33 days had no effect on measured performance of executive functions, including the Stroop color-word test, the peg-and-ball task, and the Wisconsin card-sorting task (134)
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