National Institute of Arthritis and Metabolic Diseases, National Institutes of Health, Public Health Service, U. S. Department of Health, Education, and Welfare
It has been demonstrated that extracts of human livers prepared with potassium ascorbate contain a derivative which is very active in supplying the FA requirement for L. casei, but only slightly so for P. cerevisiae or S. faecalis R. No autolytic or enzymatic treatment is required for the release of this activity.
