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 ) .
C0042847
deficiency of cbl
C0042845
cbl