It has been shown that rat liver ribosomal proteins can be acetylated both in viuo and in vitro (Liew & Gornall, 1973). After purification of the ribosomal proteins to remove any possible contamination by lipids, nucleotides and cytoplasmic protein, the radioactivity still remained in these proteins. When the [’Hlacetate-labelled ribosomal proteins were hydrolysed in strong acid at 110°C overni...
