Abstract
EVIDENCE has been presented, from investigations involving techniques of nuclear transfer and injections of cytoplasm, that certain cellular properties of Amoeba proteus and Amoeba discoides, such as nuclear diameter and sensitivity to streptomycin, are influenced by self-replicating cytoplasmic hereditary determinants1–6. The finding of DNA- and RNA-containing bodies in the cytoplasm of Amoeba proteus7–9, followed by the demonstration that these bodies are self-replicating within the cell8,9 and that they show a certain degree of interaction with the nucleus of amoeba8, has stimulated interest in the possibility that they contain the physical basis of this cytoplasmic inheritance6.
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