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The influence of penicillin on Lactobacillus leichmannii serum B12 assay
  1. Borys Boczarow
  1. Department of Pathology, Stoke Mandeville Hospital, Aylesbury, Bucks.


    The influence of penicillin on vitamin B12 assay using L. leichmannii as the test organism was investigated, and it was found that penicillin even in a low serum concentration invalidated the test.

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