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Cells from a goose embryo were shown to release particle-associated RNA-directed DNA polymerase and RNase H activities that required the presence of Nonidet P-40 for detection. The particles were not infectious and did not have endogenous DNA synthesis. The goose particle DNA polymerase was related to the DNA polymerase of spleen necrosis virus with respect to size and was inhibited by immunoglobulin G to spleen necrosis virus DNA polymerase. However, goose cells producing DNA polymerase-containing particles did not contain reticuloendotheliosis virus-related nucleotide sequences in their DNA.

RNA-directed DNA polymerase from particles released by normal goose cells