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Immunisation of Houghton White Leghorn line 15I and 6(1) chickens with empty reticuloendotheliosis virus particles elicited a primary antibody response which is probably directed against the viral envelope glycoproteins gp73/71 and gp22. Antibodies in line 15I birds were shown to be non-neutralising and did not protect against the tumourigenic effects of(More)
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