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European Neurology, 27 (2), 120129.

Knowing these mistakes can help you avoid them

For suspected macro-B12, precipitation with PEG is the test most often reached for, though it is nonspecific and can remove B12 that is fully available to cells, so direct measurement of the binding proteins, haptocorrin and transcobalamin, may be more informative when it is available

Regulatory agencies have emphasized that unapproved injectable peptides should not be promoted for human use, so each lab is responsible for maintaining compliance and keeping their work firmly in the research category rather than therapeutic practice

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