[Influence of cytosolic fraction on incorporation of aminoacids into microsomal system of rat liver (author's transl)].

1. Incorporation of 14C-leucine into a microsomal system from rat liver is decreased on old animals. 2. The decrease in 14C-leucine incorporation is not attributable to changes of the stability of the incorporation systems. 3. The decreased rate of incorporation from old animals is dependent from the cytosolic fraction.