we have previously shown that the vesicular stomatitis virus ( vsv ) host range mutant , hr 1 , is completely defective for the mrna methyltransferase activities , but can synthesize full-length , unmethylated mrnas in vitro [ s. m. horikami and s. a. moyer ( 1982 ) . proc . natl . acad . sci . usa 79 , 7694-7698 ] and in vivo [ s. m. horikami , f. de ferra , and s. a. moyer ( 1984 ) . virology 138 , 1-15 ] .
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