Morphology of a latent virus associated with hamster cells BHK-21

Abstract
The morphology of the latent virus (R virus) of the BHK-21/13S cell line is described in negative staining and thin sections. This virus contains ribonucleic acid (RNA) and matures at the endoplasmic reticulum membrane. After negative staining, it is an enveloped particle surrounded by numerous globular peplomers. Its size varies from 70 to 115 nm. The authors suggest to include it in the coronavirus group.

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