[Factors regulating protein synthesis by rabbit reticulocyte ribosomes: variations in their concentrations during cell maturation]. / Etude des facteurs intervenant dans la synthèse protéique par les ribosomes de réticulocytes de Lapin: variations de leur taux au cours de la maturation cellulaire

An activator as well as an inhibitor of protein synthesis, were isolated from rabbit reticulocyte ribosomes. The ribosomes of the erythrocytes are inactive in protein synthesis and lacked the activator. However, when the activator moiety was added to the erythrocyte ribosomes, there was a significant increase in their capacity for protein synthesis, provided these ribosomes were freed of their inhibitor by washing beforehand with a detergent.