Abstract
It is shown that the iso-1 and iso-2 cytochromes c synthesized by two strains of respiratory deficient strains of yeast (ϱ) possess one residue of ϵN-trimethyllysine and do not differ in this respect from the iso-cytochromes produced by ϱ+ strains. This result excludes the possibility that the methylation reaction is linked to respiratory activity or to the ϱ+ factor.
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