by dot blot hybridization , the probes detected measles virus nucleic acid sequences in as little as 3 nanograms of total rna extracted from measles virus-infected cells and also in highly diluted rna extracted from sspe brain , but did not detect measles virus sequences in rna extracted from 11 multiple sclerosis or 8 control brains , even at a 1 000-fold higher concentration of rna .
C0038522
sspe
C0006104
brains