1. Perfusion of the isolated rat liver was accompanied by a rising level of transcobalamin II in the perfusate. There was no change in the concentration of transcobalamin I over the 5 h perfusion period.

2. When [G-14C]leucine was added to the perfusate a 14C-labelled protein appeared in the same position as transcobalamin II on column chromatography.

3. It was concluded that transcobalamin II is synthesized by rat liver.

Keywords:
vitamin B12, transcobalamin, liver
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© 1973 The Biochemical Society and the Medical Research Society
1973
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