Protein A-gold labelling was used to detect and locate particles and two major late antigens, polyhedrin and p10, of multiply-enveloped nuclear polyhedrosis virus in thin sections of cells. With polyhedrin antiserum, gold label was found over viral occlusion bodies (polyhedra), but not over the fibrous structures associated with polyhedron morphogenesis and previously thought to consist of precondensed polyhedrin. In contrast, with p10 antiserum, gold label was found only over these fibrous structures in the nucleus and similar structures in the cytoplasm. This suggests that p10 is a major constituent of the fibrous structures and may, therefore, play an important role in polyhedron morphogenesis.


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