Water-soluble B-vitamins

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Abstract
Rats receiving a diet devoid of vitamins of the B2 group required 2 factors in addition to lactoflavin for normal growth; these factors were contained in the fuller''s earth filtrate from aqueous yeast extracts and in the Ba(0H)2 eluate from the fuller''s earth adsorbate from yeast extract, respectively. Vitamin B1 appeared to be the only heat labile member of the vitamin B complex.