Abstract
This preliminary communication describes red, watersoluble pigments elaborated by an adeninedeficient mutant of a haploid strain of yeast (Saccharomyces cerevisiœ). Acid hydrolysis of these pigments liberates a number of amino acids. Some of the physical and chemical properties of these yeast pigments resemble those of the antipernicious anaemia factor (vitamin B121) which contains one atom of cobalt and three atoms of phosphorus, with a molecular weight of 1,500. Our yeast pigments contain no cobalt but one or two atoms of phosphorus, with an approximate molecular weight of 2,000.
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