A patient with the inability to maintain in vivo levels of bound cobalamin (Cbl) and manifestations of tissue deficiency of Cbl

A 39‐year‐old woman presented with mild anemia, glossitis, an increased MCV, a low serum cobalamin (Cbl) (vitamin B12), mild tissue deficiency of Cbl, but with neither malabsorption of Cbl, impaired intake, nor deficiency of or inactivity of transcobalamin II (TC II). Because of a persistently low h...

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