{
   "source_x": "PMC",
   "title": "Isolation and Preliminary Characterization of the RNA-Containing R-Type, Virus-Like Particle of BHK-21 Cells",
   "pmcid": "PMC356749",
   "abstract": "An R-type virus-like particle (VLP) has been isolated from the medium of BHK-21-F cells by ultracentrifugation and polyethylene glycol precipitation. The R-type VLP contains RNA which sediments at 60 to 70S in sucrose density gradients and has a molecular weight of approximately 10(7), as estimated by gel electrophoresis. The R-type VLP can be labeled with (3)H-uridine in the presence of actinomycin D. On the basis of morphology, site of maturation, and preliminary biochemical characterization, the R-type VLP does not appear to fit into any of the major groups of animal viruses.",
   "authors": [
      "['Albu, Evelyn', 'Holmes, Kathryn V.']"
   ],
   "id": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC356749"
}