A method for the estimation of cytochrome concentrations in whole yeast cells was worked out with strains of Saccharornyces cerevisiae obtained in the laboratory. Differences of cytochrome c content were due to mutations affecting the nature or the quantity of synthetized cytochrome c. Respiratory Toutes les souches utilisees (Sacchromyces cerevisiae) ont 6th construites dans notre laboratoire. Les differences de teneur en cytochrome c que l'on peut observer de l'une A l'autre sont dues b des mutations affectant soit la nature, soit la quantitb du -ou des -cytochromes synth6tisbs. En particulier, nous avons utilise les differentes combinai-
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