We find a correction is necessary in the last sentence on page 625 of our article entitled An Analogof Vitamin B12 ( Science , 113 , 625 [1951]). In our original this sentence reads: The thiocyanate analog and vitamin B12a when testedby the L. lactic (A) and the L. leichmannii unprotected (B) titrimetric assay methods ( 6 ) also respondin a like manner, distinct from vitamin B12. Please publish the following correction: The thiocyanate analog and vitamin B12a, when testedby the L. lactis (B) and the L. leichmannii unprotected (A) titrimetric assay methods ( 6 ) also respondin a like manner, distinct from vitamin B12. This will also necessitate the transposition of theheadings A and B in Table 1 on page 626.
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Buhs et al. (1951) studied this question.