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Scand J Clin Lab Invest. 1977 Dec;37(8):723-8.

Unsaturated and cobalamin saturated transcobalamin I and II in normal human plasma.


Insolubilized antibody against human transcobalamin I has been used as a specific and precise tool for the separation of transcobalamin I (and III) from transcobalamin II. Range and mean (in parentheses) for the unsaturated binding capacity for twenty samples are 40-190 (90) pmol/l and 220-1170 (560) pmol/l for transcobalamin I (and III) and transcobalamin II, respectively. The similar figures for the cobalamin saturated transcobalamins are 200-549 (320) pmol/l and 75-475 (160 pmol/l. On analyses of the cobalamins attached to each of the transcobalamins, it is shown that methylcobalamin accounts for most of the cobalamins attached to transcobalamin I whereas transcobalamin II carries most of the 5'-deoxyadenosylcobalamin.

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