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Properties and relationships of broad bean stain virus and Echtes Ackerbohnenmosaik-Virus.

SUMMARY 
 
The sedimentation coefficients (s020, w) of the two sedimenting nucleoprotein components of broad bean stain virus (BBSV) were 92 S and 113 S, and of Echtes Ackerbohnenmosaik-Virus (EAMV) were 93 S and 114 S. Particles from each of these sedimenting components contained a single RNA species and two polypeptides. Estimates of the molecular weights of these constituents obtained by electrophoresis in polyacrylamide gels were: 42000 and 22200 (BBSV) and 41400 and 21800 (EAMV) for the polypeptides; and 2–64 and 1·62 × 106 (BBSV) and 271 and 175 × 106 (EAMV) for the RNAs. In mixtures, the protein and RNA components of BBSV and EAMV were indistinguishable from those obtained from particles of the yellow strain of cowpea mosaic virus. 
 
 
 
In freshly made virus preparations each of the sedimenting components of BBSV contained two, and those of EAMV contained three electrophoretic components. After storage for 7–10 days, BBSV preparations contained only the component migrating fastest towards the anode. 
 
 
 
Both BBSV and EAMV are distantly related serologically to cowpea mosaic but, whereas BBSV reacted only with antiserum to the severe strain, EAMV reacted only with antiserum to the yellow strain.