Spin coupling between electron carriers in the dehydrogenase segments of the respiratory chain.

The $\text{in vitro}$ RNA synthesis and poly(A) synthesis catalyzed by cauliflower RNA polymerase are stimulated by an addition of polyethylenimine (PEI) at a low concentration to the reaction medium. Evidence is presented that PEI exerts its stimulative effect on a reaction coexisting of enzyme, template, and substrate, and not on the template or enzyme alone.