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Each method has its advantages and disadvantages
Sources De novo synthesis (biosynthesis) Humans can synthesize choline moieties in small amounts by converting phosphatidylethanolamine into phosphatidylcholine ( Figure 2 )
A common protocol is 3 months on followed by 1 month off, completing approximately 3 cycles per year
This means purity really does vary brand to brand
A glutamine residue replaces asparagine at position 8, a modification that may reduce spontaneous chemical rearrangements or hydrolysis of the peptide backbone
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