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Distribution (means ± sem) of 57CoB12 in different regions of brain, SC, and kidneys of adult WT (n = 3) and KO (n = 3) mice. A) Injected 57CoB12 was almost equally distributed to all regions of brain and spinal cord (20–30% of total dose accumulated in brain tissue). The radioactivity observed in the KO brain was low and could be related to residual blood in the tissue. B) The KO kidneys showed higher uptake than in WT.
