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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Demonstration of vitamin B12 analogues in human sera not detected by microbiological assay.

Sera were absorbed with polyacrylamide beads to which purified human intrinsic factor was attached. This procedure removed the vitamin B12 analogues which are measured by microbiological assay with Lactobacillus leichmannii and Euglena gracilis and which are measured in an isotope dilution method using intrinsic factor. Such sera still contained B12 analogues that were assayed in an isotope dilution method using a non-intrinsic factor vitamin B12 binder. Such vitamin B12 analogues make up approximately half of the total vitamin B12 analogues in human serum.[1]

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