Abstract
H37 and Ravenel strains of tubercle bacilli grown under suitable conditions were found to synthesize varying amts. of all the B-complex substances investigated. The 2 strains produced equal amts. of biotin, pantothenic acid, pyridoxine, riboflavin and thiamin. Folic acid, [rho]-aminobenzoic acid, nicotinic acid and inositol were produced in much greater amt. by H37 than could be explained by the heavier growth of this organism.

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