it has previously been shown that the genome of rf virus , a variant of the human papovavirus , bk , consists of two dna species , one ( r1a ) with a deletion corresponding to the early and the other ( r2 ) with a deletion corresponding to the late region of bkv ( a. pater , m.m . pater , and g. di mayorca ( 1980 ) . j. virol . 36 , 480-487 ; a. pater , m. m. pater , r. m. dougherty , and g. di mayorca ( 1981a ) . virology 113 , 86-94 ) .
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