Abstract
THE results of experiments involving the transfer of nuclei or of small quantities of cytoplasm between cells of Amoeba proteus and Amoeba discoides indicate that certain cellular properties, including nuclear diameter and sensitivity to streptomycin, are influenced by self-replicating hereditary determinants in the cytoplasm of both species1–6. In cells of the A. discoides strain (T1D), but not in cells of the A. proteus strain (T1P) used in. these experiments, cytoplasmically located DNA- and RNA-containing bodies of the type described by Rabinovitch, Wolstenholme and Plaut7,8,10 have been found9.
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