RADIOASSAY OF SERUM VITAMIN B₁₂ BY QUANTITATING THE COMPETITION BETWEEN Co⁵⁷B₁₂ AND UNLABELED B₁₂ FOR THE BINDING SITES OF INTRINSIC FACTOR

Blood Research Laboratory, Department of Medicine, New York Medical College, New York, N. Y.

Supported by U. S. Public Health Service grant AM06045-02. Presented in part at the 9th Congress of the International Society of Hematology, Mexico City, September, 1962.

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